Moving Charges and Magnetism — practice questions
145 curated practice questions from Moving Charges and Magnetism (Physics Class 12, CBSE) — 10 hard, 84 medium, 51 easy. Every question includes the final answer free; step-by-step worked solutions with a free account.
- A wire carrying current I has the shape as shown in the given figure. Linear parts if the wire are very long and…
- Beams of electrons and protons move parallel to each other in the same direction. They
- An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current along the…
- Circular loop of a wire and a long straight wire carry currents I 0 and I e respectively as shown in the figure…
- A galvanometer of resistance 100 gives full scale deflection for a current of 1.0 mA. It is converted into an ammeter…
- Assertion (A): A current carrying square loop made of a wire of length L is placed in a magnetic field. It experiences…
- An electron enters a uniform magnetic field with speed v. It describes a semicircular path and comes out of the field…
- In a moving coil galvanometer, the deflecting torque acting on the coil is related to the current I flowing through it…
- The wire shown in the figure carries a current of 32 A. If r = 3.14 cm, the magnetic field at point P will be
- What is the magnetic field at a distance R from a coil of radius r carrying current I?
- A vertical straight conductor carries a current vertically upwards. A point P lies to the east of it at a small…
- A constant current is flowing through a solenoid. An iron rod is inserted in the solenoid along its axis. Which of the…
- A particle having charge +q enters a uniform magnetic field B as shown in the figure. The particle will describe:
- A long straight wire of radius a carries a steady current I . The current is uniformly distributed across its area of…
- A coil having N turns carry a current as shown in the figure. The magnetic field intensity at point P is:
- Mass of proton is 1.6 10 -27 kg. The proton enters the magnetic field of 2 T at an angle 30^ with the direction of the…
- The force on a charge due to a magnetic field can act
- A short bar magnet placed with its axis at 30° with a uniform external magnetic field of 0.35 T experiences a torque of…
- Consider two long, straight, parallel conductors A and B separated by a distance d . They carry steady current I in the…
- A loop carrying a current I clockwise is placed in x - y plane, in a uniform magnetic field directed along z-axis. The…
- A proton and an -particle enter with the same velocity v in a uniform magnetic field B such that v B . The ratio of the…
- A straight conducting rod of length l and mass m is suspended in a horizontal plane by a pair of flexible strings in a…
- A long straight wire is held vertically and carries a steady current in upward direction. The shape of magnetic field…
- A particle of mass m and charge q moves along y -axis in a region in which a uniform magnetic field B is pointing along…
- A galvanometer of resistance 100 is converted into an ammeter of range ( 0-1 ~A ) using a resistance of 0.1 . The…
- When a charged particle moving with velocity v is subjected to a magnetic field of induction B , the force on it is…
- Point out the correct direction of magnetic field in the given figures.
- Two identical long conducting wires AOB and COD are placed at a right angle to each other, with one above the other…
- The magnetic force acting on a charged particle of charge -2 C in a magnetic field of 2T acting in the y-direction…
- An isosceles right angled current carrying loop PQR is placed in a uniform magnetic field B pointing along PR. If the…
- A particle of mass m and charge q is moving with velocity v =v_ x i +v_ y j . If it is subjected to a magnetic field B…
- The magnetic field at P on the axis of a solenoid having 100 turns/m and carrying a current of 5 A is
- Assertion (A): The torque acting on a current carrying coil is maximum when it is suspended in a radial magnetic field…
- Two parallel conductors carrying current of 4.0 A and 10.0 A are placed 2.5 cm apart in vacuum. The force per unit…
- A particle having charge q and mass m starts moving from the origin under the action of an electric field E =E_ 0 i and…
- The torque required to hold a small circular coil of 10 turns, area 1 mm 2 and carrying a current of ( 21 44 ) A in the…
- A straight wire is kept horizontally along east-west direction. If a steady current flows in wire from east to west…
- Electron is moving perpendicular to z-axis; the magnetic field B 0 is present along the z-axis; the radius of the…
- An electron with velocity v = (v_x i +v_y j ) moves through a magnetic field B = (B_x i -B_y j ) . The force F on the…
- A current of 10A is flowing from east to west in a long straight wire kept on a horizontal table. The magnetic field…
- A closely wound solenoid of 1000 turns and area of cross section 1.4 × 10 –4 m 2 carrying a current of 3 A is suspended…
- A galvanometer of resistance G is converted into an ammeter of range 0 to IA. If the current through the galvanometer…
- Two similar coils of radius is R are lying concentrically with their planes at right angles to each other. The currents…
- In the question number 42, if velocity is normal in the shorter side then the voltage developed is
- In the following diagram which particle has the highest em value?
- If a solenoid is having magnetic moment of 0.65 J T –1 is free to turn about the vertical direction and has a uniform…
- Under the influence of a uniform magnetic field, a charged particle is moving in a circle of radius R with constant…
- A current of 10 A is flowing from east to west in a long straight wire kept on a horizontal table. The magnetic field…
- The resistance of an ammeter is 13 and its scale is graduated for a current up to 100 A. After an additional shunt has…
- An uncharged particle is moving with a velocity of v in non-uniform magnetic field as shown. Velocity v would be:
- A millivoltmeter of 25 millivolt range is to be converted into an ammeter of 25-ampere range. The value (in ohm) of the…
- A region has a uniform magnetic field in it. A proton enters into the region with velocity making an angle of 45 o with…
- A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force…
- A galvanometer having a coil resistance of 48 shows full-scale deflection for a current of 2.0 A. It can be converted…
- The value of magnetic field at point O in the given figure is:
- Two long, straight, parallel conductors carry the same current and attract each other with a force F per unit length…
- A thin ring of radius R metre has charge q coulomb uniformly spread on it. The ring rotates about its axis with a…
- Two parallel wires of length 9 m each are separated by a distance of 0.15 m. If they carry equal currents in the same…
- Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit…
- In a circular loop of radius R, current I enters at point A and exits at point B , as shown in the figure. The value of…
- An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the…
- A long straight wire of circular cross-section (radius a) carries a steady current I and the current I is uniformly…
- In an ammeter, 0.2% of the main current passes through the galvanometer. If the resistance of the galvanometer is G…
- Consider the circular loop having current i and with central point O. The magnetic field at the central point O is
- Assertion (A): The magnetic field produced by a current-carrying solenoid is independent of its length and…
- A galvanometer of resistance G, is shunted by a resistance S ohm. To keep the main current in the circuit unchanged…
- A long straight wire of radius a carries a steady current I . The current is uniformly distributed across its area of…
- Assertion (A): A proton and an alpha particle having same kinetic energy are moving in circular paths in a uniform…
- A beam of ions enters normally into a uniform magnetic field of 4 10 -2 tesla with velocity of 2 10 5 m/ s If the…
- Assertion (A): Two long parallel wires, freely suspended and connected in series to a battery, move apart. Reason (R)…
- Assertion (A): A proton and an alpha particle having the same kinetic energy are moving in circular paths in a uniform…
- Two circular loops of areas A and 4A carry currents 2I and I respectively. The magnetic fields at their centres will be…
- Which of the following graphs correctly represents the variation of the magnitude of the magnetic field outside a…
- A particle with charge q moving with velocity v =v_ 0 i enters a region with magnetic field B =B_ 1 j +B_ 2 k . The…
- An α-particle and a proton are accelerated through the same potential difference. The ratio of linear momenta acquired…
- An electron gun with its anode at a potential of 100 V fires out electrons in a spherical bulb containing hydrogen gas…
- A square loop ABCD carrying a current i is placed near and coplanar with a long straight conductor XY carrying a…
- Assertion (A): Magnetic field interacts with a moving charge and not with a stationary charge. Reason (R): A moving…
- A closely wound solenoid of 2000 turns and area of cross-section 1.5 10 -4 m 2 carries a current of 2.0 A. It is…
- Two wires carrying currents l 1 and l 2 lie, one slightly above the other, in a horizontal plane as shown in figure…
- A circular loop of radius r, carrying a current I lies in y-z plane with its centre at the origin. The net magnetic…
- A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the…
- A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 10 -4 A gives a deflection of 1 division. To…
- What uniform magnetic field applied perpendicular to a beam of electrons moving at 1.3 10 6 m/s, is required to make…
- The current I flowing through a conductor of radius r is uniformly distributed across its cross-section. Which of the…
- A galvanometer of resistance 50 is converted into a voltmeter of range (0-2 ~V ) using a resistor of 1.0 k . If it is…
- Assertion (A): The torque on the coil is maximum when the coil is suspended in a radial magnetic field. Reason (R): The…
- An electron and a proton are moving along the same direction with the same kinetic energy. They enter a uniform…
- An electron having charge 1.6 10 -19 C and mass 9 10 -31 kg is moving with 4 10 6 m/s speed in a magnetic field of 2 10…
- Two horizontal thin long parallel wires, separated by a distance r carry current I each in the opposite directions. The…
- A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to the field B…
- A current of ( 10 ) A is maintained in a circular loop of radius 14 cm. The value of dipole moment associated with the…
- A galvanometer has a coil of resistance 100 ohm and gives a full-scale deflection for 30 mA current. If it is to work…
- A straight wire of length 1.0 m is placed along x-axis, in a region with magnetic field B =(3 i +2 j ) T . A current of…
- A very long straight wire carries a current I. At the instant when a charge + Q at point P has the velocity v as shown…
- The current sensitivity of a galvanometer does not depend on the:
- A straight current carrying conductor is placed inside a uniform magnetic field. The force per unit length acting on…
- Two tangent galvanometers having coils of the same radius are connected in series. A current flowing in them produces a…
- A 10 cm long wire lies along y-axis. It carries a current of 1.0 A in positive y-direction. A magnetic field B =(5 mT )…
- A voltmeter has a resistance of G ohm and a range of V volt. The value of resistance used in series to convert it into…
- A current I flows through a long straight conductor which is bent into a circular loop of radius R in the middle as…
- A closely wound solenoid of 750 turns and area of cross section 5 × 10 –4 m 2 carries a current of 3.0 A. Its…
- Two thin long parallel wires A and B are separated by a distance r and carry current I each in the same direction. The…
- A current of 5 A is flowing from east to west in a long straight wire kept on a horizontal table. The magnetic field…
- A galvanometer can be converted into an ammeter of desired range by connecting a:
- A circular loop of wire, carrying a current 'I' is lying in xy-plane with its centre coinciding with the origin. It is…
- A 2.0 cm segment of wire, carrying 5.0 A current in positive y-direction lies along y-axis, as shown in the figure. The…
- For the magnetic field to be maximum due to a small element of current-carrying conductor at a point, the angle between…
- A wire of length l carries current i along x-axis. A magnetic field exists given by B=B_ 0 ( i + j + k ) T. The…
- A straight conductor is carrying a current of 2 A in +x direction along it. A uniform magnetic field B =(0.6 j +0.8 k )…
- Assertion (A): When radius of a current carrying loop is doubled, its magnetic moment becomes four times. Reason (R)…
- A galvanometer having a coil resistance of 60 shows full-scale deflection when a current of 1.0 amp passes through it…
- The magnetic field intensity due to a thin wire carrying current I in the figure shown is
- A particle of mass m and charge q moving with velocity v i is subjected to a uniform electric field E j . The particle…
- Assertion (A): A charged particle is moving with velocity v in x - y plane, making an angle (0 2 ) with x-axis. If a…
- A galvanometer shows full scale deflection for a current I_ g . If a shunt of resistance S_ 1 is connected to the…
- The magnetic field at the centre of a current carrying circular loop of radius R, is B 1 . The magnetic field at a…
- A solenoid of cross-sectional area 2 × 10 –4 m 2 and 900 turns has 0.6 Am 2 magnetic moment. Then the current flowing…
- A circuit contains an ammeter, a battery of 30 V and a resistance of 40.8 ohm all connected in series. If the ammeter…
- A 1 cm straight segment of a conductor carrying 1 A current in x direction lies symmetrically at origin of Cartesian…
- The work done in moving a dipole from its most stable to most unstable position in a 0.09 T uniform magnetic field is…
- Two charged particles, P and Q , each having charge q but of masses m_1 and m _2 , are accelerated through the same…
- A current carrying circular loop of magnetic moment M is suspended in a vertical plane in an external magnetic field B…
- 20 amp current is flowing in a long straight wire. The intensity of the magnetic field at a distance of 10 cm from the…
- Two long straight parallel conductors A and B, kept at a distance r, carry current I in opposite directions. A third…
- Assertion (A): A planar loop of irregular shape carrying current is subjected to a magnetic field acting perpendicular…
- A current carrying wire kept in a uniform magnetic field, will experience a maximum force when it is
- A coil in the shape of an equilateral triangle of side l is suspended between the pole pieces of a permanent magnet…
- Two long parallel wires kept 2 m apart carry 3A current each, in the same direction. The force per unit length on one…
- A charged particle gains a speed of 10^ 6 ms ^ -1 , when accelerated from rest through a potential difference 10 kV. It…
- Two insulated concentric coils, each of radius R, placed at right angles to each other, carry currents I and 3 I…
- A particle of mass m and charge q describes a circular path of radius R in a magnetic field. If its mass and charge…
- Assertion(A): The deflection in a galvanometer is directly proportional to the current passing through it. Reason(R)…
- Assertion (A): The energy of charged particle moving in a uniform magnetic field does not change. Reason (R): Work done…
- A long straight wire of radius carries a steady current I. The current is uniformly distributed over its cross-section…
- A galvanometer coil has a resistance of 10 and the meter shows full-scale deflection for a current of 1 mA. The shunt…
- A current of 5 A is flowing in a wire of length 1.5 cm. A force of 7.5 mN acts on it when it is placed in a uniform…
- A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire is suspended vertically in a uniform…
- A circular loop A of radius R carries a current I. Another circular loop B of radius r (= R 20 ) is placed…
- A 1 cm segment of a wire lying along x -axis carries current of 0.5 A along +x direction. A magnetic field B =(0.4 mT )…
- A circular coil of 25 turns and radius of 12 cm is placed in a uniform magnetic field of 0.5 T normal to the plane of…
- A current-carrying closed loop in the form of a right-angle isosceles triangle ABC is placed in a uniform magnetic…
- Assertion (A): Magnetic field is not associated with a stationary charge. Reason (R): A magnetic field can be detected…
- A straight wire of diameter 0 5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying the…
- Assertion (A): When radius of a circular loop carrying a steady current is doubled, its magnetic moment becomes four…