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Current Electricity — BITSAT Physics PYQs

36 previous year questions from Current Electricity with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

Current Electricity — BITSAT Physics PYQs

In the given circuit, E₁=E₂=E₃=2 ~V and R₁=R₂=4 , then current flowing through the branch A B is

In the following circuit diagram, when 3 resistor is removed, then equivalent resistance of the network

A conducting wire is stretched by applying a deforming force, so that its diameter decreases to 40 % of original value. The percentage change in its resistance will be

A wire of resistance 160 is melted and drawn in wire of one-fourth of its length. The new resistance of the wire will be

Five cells each of emf E and internal resistance r send the same amount of current through an external resistance R whether the cells are connected in parallel or in series. Then t

Ratio of thermal energy released in two resistor R and 3 R connected in parallel in an electric circuit is :

The resistance of a wire is 5 . It's new resistance in ohm if stretched to 5 times of its original length will be :

In the arrangement shown in figure, when the switch S₂ is open, the galvanometer, shows no deflection for l=50 ~cm when the switch S₂ is closed, the galvanometer shows no deflectio

An electric current I enters and leaves a uniform circular wire of radius r through diametrically opposite points. A charged particle q moves along the axis of circular wire passes

A wire of a certain material is stretched slowly by ten per cent. Its new resistance and specific resistance become respectively:

A moving coil galvanometer has resistance of 10 and full scale deflection of 0.01 ~A . It can be converted into voltmeter of 10 ~V full scale by connecting into resistance of

Two wires A and B of the same material, having radii in the ratio 1: 2 and carry currents in the ratio 4: 1 . The ratio of drift speed of electrons in A and B is

Determine the current in 2 resistor.

The value of current I as shown in the given circuit diagram is

An ammeter of resistance 1 . 5 &#937; can measure currents upto 1 A . The value of shunt resistance to measure current upto 4 A is

A carbon resistor of 56 &#177; 5 . 6 k&#937; is to be marked with rings of different colours for its identification. The colour code sequence will be

In the circuit given below, the value of resistance X , when the potential difference between the points B and D is zero, will be

In the given circuit, it is observed that the current I is independent of the value of resistance R 5 . Then, the resistance value must satisfy

The resistance of a wire at 20 &#176; C is 20 &#937; and 500 &#176; C is 60 &#937; . At which temperature, its resistance will be 25 &#937; ?

In the circuit shown, the heat produced in 5 &#937; resistor is 10 cal s - 1 . The heat produced per sec in 4 &#937; resistor will be

In the circuit shown in the figure, find the current in 45 .

The drift velocity of electrons in silver wire with cross-sectional area 3.14 10⁻⁶ ~m ² carrying a current of 20 ~A is. Given atomic weight of Ag =108, density of silver =10.5 10³

Two resistances at 0^ C with temperature coefficient of resistance ₁ and ₂ joined in series act as a single resistance in a circuit. The temperature coefficient of their single res

The resistance of a wire is R . It is bent at the middle by 180^ and both the ends are twisted together to make a shorter wire. The resistance of the new wire is

A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if

A wire X is half the diameter and half the length of a wire Y of similar material. The ratio of resistance of X to that of Y is

For the circuit (figure), the current is to be measured. The ammeter shown is a galvanometer with a resistance R _ G =60.00 converted to an ammeter by a shunt resistance r _ s =0.0

What should be the characteristic of fuse wire?

In the circuit shown in figure potential difference between points A and B is 16 ~V . the current passing through 2 resistance will be

Three voltmeters A , B and C having resistances R , 1.5 R and 3 R , respectively, are connected as shown. When some potential difference is applied between X and Y , the voltmeter

A letter'A' is constructed of a uniform wire with resistance 1.0 per cm , The sides of the letter are 20 ~cm and the cross piece in the middle is 10 cm long. The apex angle is 60 .

Calculate the effective resistance between A and B in following network.

The power dissipated in the circuit shown in the figure is 30 Watts. The value of R is

Which of the following quantities do not change when a resistor connected to a battery is heated due to the current?

The length of a potentiometer wire is . A cell of emf E is balanced at a length / 3 from the positive end of the wire. If the length of the wire is increased by / 2 . At what dista

An ammeter reads upto 1 ampere. Its internal resistance is 0.81 ohm . To increase the range to 10 A the value of the required shunt is

An ammeter of resistance 1 . 5 Ω can measure currents upto 1 A . The value of shunt resistance to measure current upto 4 A is

A carbon resistor of 56 ± 5 . 6 kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be

The resistance of a wire at 20 ° C is 20 Ω and 500 ° C is 60 Ω . At which temperature, its resistance will be 25 Ω ?

In the circuit shown, the heat produced in 5 Ω resistor is 10 cal s - 1 . The heat produced per sec in 4 Ω resistor will be