Current Electricity — practice questions

110 curated practice questions from Current Electricity (Physics JEE Main, NTA Exams) — 97 easy, 6 medium, 7 hard. Every question includes the final answer free; step-by-step worked solutions with a free account.

A 200 volt,1000 watt bulb is connected across 100 volt main supply.What will be power consumed.
What is the total resistance of the circuit ?
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
Find out the value of current through 2Ω resistance for the given circuit.
Two wires of the same dimensions but resistivities ρ 1 and ρ 2 are connected in series. The equivalent resistivity of…
How will you connect 24 cells each of internal resistance of 1Ω so as to get maximum power output across a load of 1.50…
An electric bulb is designed to draw power P 0 at voltage V 0 . If the voltage is V and it draws a power P . Then:
Two electric bulbs marked 25 W–220 V and 100 W-220 V are connected in series to a 440 V supply. Which of the bulbs will…
A 100 watt,110 volt and a 50 watt,110 volt lamps are connected in series across 220 volt d.c. source. If the…
Kirchhoff's second law, i.e. ΣE - IR = 0 around a closed loop is based on the law of conservation of
The specific resistance of a wire is ρ, its volume is 3 m 3 and its resistance is 3 ohm, then its length will be
The current in the primary circuit of a potentiometer wire is 0.5 A, specific resistance of wire is 4 × 10 –7 Ω–m and…
An idealized voltmeter is connected across the terminals of a 15 volt battery and a 7.5 ohm appliance is also connected…
A set of 'n' equal resistors, of values, 'R' each, are connected in series to a battery of emf 'E' and internal…
In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of…
A non-conducting wire of radius R has charge q distributed unevenly over it. If it is rotated with an angular velocity…
A 220 volt, 1000 watt bulb is connected across a 110 volt mains supply. The power consumed will be
A straight conductor of uniform cross-section carries a current I. The charge to mass ratio of an electron is…
A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the…
A (100 W, 200 V) bulb is connected to a 160 V supply. The power consumption would be
The length of conductor is doubled and its radius is halved, its specific resistance is
Consider the following statements regarding the network shown in the figure (i) The equivalent resistance of the…
What will be the resistance between P and Q in the following circuit ?
As the temperature of a conductor increases, its resistivity and conductivity changes .The ratio of resistivity to…
Let C be the capacitance of a capacitor discharging through a resistor R. Suppose t 1 is the time taken for the energy…
Kirchhoff's first law, i.e. Σ I = 0 at a junction, deals with the conservation of
In a potentiometer, experiment, the balancing length is at 240 cm with a cell. On shunting the cell with a resistance…
A thin wire of resistance 4 Ω is bent to form a circle. The resistance across any diameter is
In the circuit shown in figure, if value of R = 60 Ω , then the current flowing through the condenser will be
50 electric bulbs are connected in series across 200 volt supply and illumination produced is I 1 . 5 bulbs get fused…
On increasing the temperature of a conductor, its resistance increases because
A resistance of 2 Ω is connected across one gap of a meter bridge, the length of wire is 1 meter, and an unknown…
You are given three equal resistors. How many resistances can be obtained by joining them in series and parallel…
The resistance of the series combination of two resistances is S. When they are joined in parallel, the total…
Given below are two statements Statement I : The electric bulb glows immediately when switch is on. Statement II : The…
The heating element of an electric heater should be made with a material which should have
What is the value of R so that ammeter reads zero in the circuit shown below.
If two bulbs of wattage 25 and 30 watt each rated at 220 volt are connected in series with 440 volt supply. Which bulb…
When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by…
One end of copper wire of length 2L and cross sectional area A is attached to one end of another copper wire of length…
A wire connected in the left gap of a meter bridge balance a 10Ω in the right gap at a point which divides the bridge…
The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and…
A resistance of 2 Ω is to be made from a copper wire (specific resistance 1.7 × 10 –8 Ω m) using a wire of length 50…
Determine the value of resistance R if the current in branch OA is zero.
In the Bohr model of hydrogen atom, the electron is pictured to rotate in a circular orbit of radius 5 10^ -11 m, at a…
A coil has resistance of 18 Ω when its mean temperature is 20 o C and of 20 Ω when its mean temperature is 50 o C. What…
The supply voltage in a room is 120 V. The resistance of the lead wires is 6Ω. A 60W bulb is already switched on. What…
Heat produced (in cal) in a resistance R when a current I amperes flows through it for t seconds is given by the…
In figure, if the potential at point P is 100 V, what is the magnitude of potential(in V) at point Q ?
Read the following statements carefully Y: The resistivity of semiconductor decreases with increase of temperature Z…
Four identical capacitors are connected in series with a battery of emf 10V. The point X is earthed. Then the potential…
The heat produced in the capacitors on closing the switch S is
You need to produce a set of cylindrical copper wires 3.50 m long that will have a resistance of 0.125 each. What will…
Given below are two statements Statement I : When resistances are connected in parallel current distributes in the…
Given below are two statements. STATEMENT - 1: A current flows in a conductor only when there is an electric field…
There are two electric bulbs of 40 watt and 60 watt connected parallel to a battery. The ratio of their resistance will…
For a cell terminal potential difference is 2.2 volt when circuit is open and reduces to 1.8 volt when cell is…
In a meter bridge experiment, null point is obtained at 20 cm from one end of the wire when resistance X is balanced…
Given below are two statements. STATEMENT - 1: Current is passed through a metallic wire, heating it red. When cold…
A cylinderical wire is stretched so that its length increases by 100%. Assuming density of wire to be constant during…
A d.c. main supply of e.m.f. 220 V is connected across a storage battery of e.m.f 200 V through a resistance of 1Ω. The…
A galvanometer of coil resistance 20Ω gives a full scale deflection with a current of 5 mA. What arrangement should be…
Five cells each of e.m.f. E and internal resistance r are connected in series. If due to oversight one cell gets…
The approx effective resistance between A and B in figure is
A battery is charged at a potential of 15 volt for 8 hours when current flowing is 10 A.The battery on discharge…
What is the current I in the circuit as shown in figure
A nichrome wire 1 m long and 1 mm 2 in cross-section area draws 4 A current at 2 volt. The resistivity of nichrome is
The temperature coefficient of resistance for a wire is 0.00125°C –1 . At 300 K its resistance is 1 ohm. The…
The resistance of a 10 m long wire is 10 Ω. Its length is increased by 25% by stretching the wire uniformly. The…
The length of a potentiometer wire is 5 metres. An electron in this wire experiences a force of 4.8 × 10 –19 newton…
In a potentiometer experiment, there is no current at the balance point in
The time constant of the shown circuit for charging is
A uniform wire of resistance 36 Ω is bent in the form of a circle. The effective resistance across the points A and B is
The figure shows a network of currents. The magnitude of currents is shown here. The current I will be
In a Wheatstone’s bridge, three resistances P, Q and R are connected in the three arms and the fourth arm is formed by…
A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the…
The Kirchhoff’s first law (Σq= 0) and second law (Σ∆E= 0)where the symbols have their usual meanings, are respectively…
A candidate connects a moving coil voltmeter V, a moving coil ammeter A and a resistor R as shown in figure. If the…
A thermocouple is made from two metals Antimony and Bismuth. If one junction of the couple is kept hot and the other is…
In the circuit shown in figure, what will be the reading of the voltmeter ?
In the circuit shown in figure potential difference between X and Y will be
Total current supplied to the circuit by the battery is
In the following circuit figure, the resistance of wire AB is 10 Ω and its length is 1m. Rest of the quantities are…
In the figure shown below, the electric current flowing through 2R resistor is
Two real batteries are connected in series with same polarity. Consider the following statements (i) The equivalent…
In meter bridge or wheatstone bridge for measurement of resistance, the known and the unknown resistances are…
A coil takes 15 minutes to boil certain amount of water, another coil takes 20 minutes for the same process .Time taken…
In the circuit shown, some potential difference is applied between A & B. The equivalent resistance between A & B is
By using only two resistance coil-singly, in series or in a parallel one should be able to obtain resistance of 3, 4…
Two identical cells connected in series send 1.0 amp of current through a 5 ohm resistance.When they are connected in…
A wire of resistance 6 Ω is cut into three equal pieces, which are joined to form a triangle. The equivalent resistance…
Two resistances are joined in parallel whose resistance is 3/5 Ω. One of the resistance wire is broken and the…
In the circuit diagram shown below each resistance is of value 1 ohm, what is the euivalent resistance between the…
The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then:
An electric bulb is rated 220 volt-100 watt. The power consumed by it, when operated on 110 volt will be
What is the equivalent resistance between A and B in the circuit of figure, if R = 3 Ω,
Two plates of same material R and S are in the form of a square and have the same thickness. A side of S is twice the…
A piece of copper and silicon are cooled from room temperature to 100 K. The resistance of
By increasing the temperature, the specific resistance of a conductor and semiconductor
Which of the following material has negative temperature coefficient of resistance.
The figure shows currents in a part of an electric circuit, then current I is
A 5 V battery with internal resistance 2 Ω and a 2 V battery with internal resistance 1 Ω are connected to a 10 Ω…
All the edges of a block with parallel faces are unequal. Its longest edge is twice its shortest edge. The ratio of the…
Which of the following material has nearly zero temperature coefficient of resistance.
The Wheatstone’s bridge shown in figure is balanced. If the position of the cell E and galvanometer G are now…
A resistor R and 2µF capacitor in series are connected through a switch to 200 V direct supply. Across the capacitor is…
The terms or quantities in electricity analogous to temperature and friction in mechanical motion are respectively?
Let C be the capacitance of a capacitor discharging through a resistor R. Suppose t 1 is the time taken for the energy…
The resistors of resistances 2 Ω, 4 Ω and 8 Ω are connected in parallel, then the equivalent resistance of the…
A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

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