Magnetic Effects of Current and Magnetism — practice questions
78 curated practice questions from Magnetic Effects of Current and Magnetism (Physics JEE Main, NTA Exams) — 64 easy, 8 medium, 6 hard. Every question includes the final answer free; step-by-step worked solutions with a free account.
- A long straight wire carries a constant current of 5 Amp. At a distance of 10 cm from the straight wire, a small…
- A magnetising field of 2 × 10 3 amp/m produces a magnetic flux density of 8π tesla in an iron rod. The relative…
- Proton, deuteron and alpha particles of same kinetic energy are moving in circular trajectories in a constant magnetic…
- The angles of dip at the poles and the equator respectively are
- A particle of charge – 16 × 10 –18 C moving with velocity 10 ms –1 along the x-axis enters a region where a magnetic…
- If a current is passed through a spring then the spring will
- A circular coil carrying a certain current produces a magnetic field B 0 at its centre. The coil is now rewound so as…
- A thin circular disc of radius R is uniformly charged with density σ > 0 per unit area. The disc rotates about its axis…
- The magnetic susceptibility of a material of a rod is 499. Permeability of vacuum is 4π × 10 –7 H/m. Absolute…
- A particle having charge 100 times that of an electron is revolving in a circular path of radius 0.8 m with one…
- A thin rectangular bar magnet suspended freely has period of oscillation of 4 seconds. What will be period of…
- A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an…
- In a magnetic meridian of a certain place, horizontal component of earth’s field is 0.25G and the angle of dip is 60 o…
- A charged particle of mass m and charge q travels on a circular path of radius r that is perpendicular to magnetic…
- The total intensity of the Earth’s magnetic field at equator is 5 units. What is its value at the poles ?
- Consider two thin identical conducting wires covered with very thin insulating material. One of the wires is bent into…
- A charged particle of mass m and charge q travels on a circular path of radius r that is perpendicular to a magnetic…
- Magnetic field at the centre of a circular coil of radius R due to i flowing through it is B. The magnetic field at a…
- A bar magnet of magnetic moment m is cut into two parts of equal length. The magnetic moment of each part will be
- A steady current is set up in a cubic network composed of wires of equal resistance and length d as shown in figure…
- Two long conductors, separated by a distance 'd' carry currents I_ 1 and I_ 2 in the same direction. They exert a force…
- An electron is moving along positive x axis. A uniform electric field exists towards negative y axis. What should be…
- A solenoid has core of a material with relative permeability 400.The winding of the solenoid are insulated from the…
- If a charged particle is describing a circle of radius r in a magnetic field with a time period T, then
- A charged particle enters a uniform magnetic field with velocity vector at an angle of 45º with the magnetic field. The…
- Which particles will have minimum frequency of revolution when projected with the same velocity perpendicular to…
- A straight horizontal wire of mass 10 mg and length 1 m carries a current of 2 ampere .What minimum magnetic field B…
- When two parallel wires carry currents in the same direction:
- In the product array l F =q( v B ) =q v (B t +B j +B_ n k ) array For q = 1 and v =2 i +4 j +6 k and F =4 i -20 j +12 k…
- Two parallel wires carry currents of 20 A and 40 A in opposite directions. Another wire carrying current of 20 A and…
- A long solenoid has 800 turns per metre length of solenoid. A current of 1.6 A flows through it. The magnetic induction…
- Two long parallel wires are at a distance 2d apart. They carry steady equal current flowing out of the plane of the…
- An element d = dx i (where dx = 1 cm) is placed at the origin and carries a large current I = 10A. What is the magnetic…
- The materials suitable for making electromagnets should have-
- Of the following figure, the lines of magnetic induction due to a magnet SN, are given by (1) (2) (3) (4)
- A uniform magnetic field parallel to the plane of paper, existed in space initially directed from left to right. When a…
- A current of 2 ampere is passed in a coil of radius 0.5 m and number of turns 20. The magnetic moment of the coil is
- A deutron of kinetic energy 50 keV is describing a circular orbit of radius 0.5 metre in a plane perpendicular to…
- A long solenoid has 200 turns per cm and carries a current I . The magnetic field at its centre is 6.28 x 10 -2 weber/m…
- The magnetic lines of force due to horizontal component of earth’s magnetic field will be
- Given below are two statements : Statement I : O 2 , Cu 2+ and Fe 3+ are weakly attracted by magnetic field and are…
- A bar magnet of length 3 cm has a point A and B along axis at a distance of 24 cm and 48 cm on the opposite ends. Ratio…
- The magnetic induction along the axis of an air cored solenoid is 0.03 T. On placing an iron core inside the solenoid…
- All straight wires are very long. Both AB and CD are arcs of the same circle, both subtending right angles at the…
- The coercivity of a bar magnet is 4000A/m .In order to demagnetize it is placed inside a solenoid of length 12 cm and…
- A current carrying power line carries current from west to east. The direction of magnetic field 1m above the power…
- An iron rod of length 20 cm and diameter 1 cm is placed inside a solenoid on which the number of turns is 600. The…
- Three straight parallel current carrying conductors are shown in the figure. The force experienced by the middle…
- A current I 1 carrying wire AB is placed near an another long wire CD carrying current I 2 , as shown in Figure. If…
- A current i ampere flows along an infinitely straight thin walled tube, then the magnetic induction at any point inside…
- Through two parallel wires A and B, 10A and 2A of currents are passed respectively in opposite directions. If the wire…
- A steel wire of length l has a magnetic moment M. It is bent into L shape from the middle. The new magnetic moment is
- A charged particle with charge q enters a region of constant, uniform and mutually orthogonal fields E and B with a…
- A toroidal solenoid has 3000 turns and a mean radius of 10 cm. It has soft iron core of relative permeability 2000…
- A wire of length L metre carrying a current I ampere is bent in the form of a circle. Its magnitude of magnetic moment…
- A uniform electric field and a uniform magnetic field are pointed in the same direction. If an electron is projected in…
- Two thin, long, parallel wires, separated by a distance d carry a current of I ampere in the same direction. They will
- A long solenoid is formed by winding 20 turns/cm. The current necessary to produce a magnetic field of 20 milli tesla…
- A long, straight, solid metal wire of radius 2 mm carries a current uniformly distributed over its circular…
- At a certain place, horizontal component of Earth’s field is 3 times the vertical component. The angle of dip at this…
- The mass of iron rod is 80 gm and its magnetic moment is 10A.m 2 .If the density of iron is 8 gm/cc, then the value of…
- The current in wire is directed towards east and the wire is placed in magnetic field directed towards north. The force…
- A metal wire of mass m slides without friction on two rails placed at a distance apart. The track lies in a uniform…
- Two thin long parallel wires separated by a distance 'b' are carrying a current i ampere each. The magnitude of the…
- The forces existing between two parallel current carrying conductors is F. If the current in each conductor is doubled…
- Magnetic field intensity H at the center of a circular loop of radius r carrying current ' I ' in emu system is
- If an electron and a proton having same momenta enter perpendicularly to a magnetic field, then
- The magnetic flux density B at a distance r from a long straight rod carrying a steady current varies with r as shown…
- An electron has a circular path of radius 0.01 m in a perpendicular magnetic induction 10 –3 T. The speed of the…
- Wires 1 and 2 carrying currents I 1 and I 2 respectively are inclined at an angle θ to each other. What is the force on…
- A horizontal overhead powerline is at a height of 4m from the ground and carries a current of 100 A from east to west…
- Two thin long, parallel wires, separated by a distance d carry a current of i Amp in the same direction. They will
- An ionized gas contains both positive and negative ions. If it is subjected simultaneously to an electric field along…
- A sensitive magnetic instrument can be shielded very effectively from outside magnetic field by placing it inside a box…
- At a certain place, the horizontal component of the earth’s magnetic field is B 0 and the angle of dip is 45°. The…
- A current I flowing through the sides of an equilateral triangle of side a. The magnitude of the magnetic field at the…
- A thin ring of radius R metre has charge q coulomb uniformly spread on it. The ring rotates about its axis with a…
- If a magnetising field of 2000 A/m produces a magnetic flux density of 1 T in a material. Then the relative…