## 50+ NEET MCQ Questions Current Electricity with Solutions

Here we will provide you the 50+ MCQ Questions of Current Electricity for NEET-UG. Current Electricity is the chapter 3 in Class XII or Class 12 Physics NCERT Unit Current Electricity NEET (conducted by NTA) is based on the NCERT book.

These 50+ MCQ questions are selected by the experts of studyrate.in and these are more difficult questions, which will help you to better understand Current Electricity NEET MCQ Questions with Answers.

# Current Electricity NEET MCQ

A copper wire of diameter 1mm and length 1m is stretched by a force of 100N. If the Young’s modulus of copper is 1.2 x 10¹¹ N/m², what will be the increase in its resistance?
a) 1.28 x 10⁻⁶Ω
b) 2.56 x 10⁻⁶Ω
c) 3.84 x 10⁻⁶Ω
d) 5.12 x 10⁻⁶Ω

Two cells, each of emf E and internal resistance r, are connected in series with a variable resistance R. The value of R for which the potential difference across the cells is minimum is:
a) r
b) R = √(3)r
c) R = 3r
d) R = √(2)r

A wire of resistance R is cut into two equal parts and they are connected in parallel. The effective resistance of the combination will be:
a) R/2
b) R/3
c) R/4
d) R/6

A wire of resistance R is stretched uniformly so that its length is increased by 50%. The percentage increase in its resistance is:
a) 100%
b) 150%
c) 225%
d) 300%

A circuit consists of a battery of emf 6V, a 2Ω resistor, and a resistance R connected in series. If a current of 1A flows through the circuit, what is the value of R?
a) 2Ω
b) 4Ω
c) 6Ω
d) 8Ω

A wire of resistance 20Ω is bent into a square. What will be the effective resistance between the two diagonally opposite corners?
a) 5Ω
b) 10Ω
c) 20Ω
d) 40Ω

Two wires of equal length and radius have resistances R and 2R. They are connected in series and a potential difference is applied across the(continued) combination. If the heat produced in the first wire is Q, what will be the heat produced in the second wire?
a) Q/2
b) Q
c) 2Q
d) 4Q

Two identical bulbs, each of resistance R, are connected in parallel to a battery of emf E and internal resistance r. If the total power dissipated by the bulbs is P, what will be the power dissipated in one of the bulbs?
a) P/2
b) P/3
c) P/4
d) P/6

A wire of resistance 2Ω is bent into a semicircle. Two such semicircles are connected in series. What will be the effective resistance of the combination?
a) 1Ω
b) 2Ω
c) 3Ω
d) 4Ω

A wire of resistance 10Ω is cut into four equal parts and they are connected in parallel. The effective resistance of the combination will be:
a) 2.5Ω
b) 5Ω
c) 10Ω
d) 20Ω

In a Wheatstone bridge, the ratio of the resistances in the two arms is 3:4. If the galvanometer shows no deflection, what will be the ratio of the resistances in the other two arms?
a) 2:3
b) 3:2
c) 4:3
d) 3:5

Two wires of same material and length but of radii in the ratio 1:2 are connected in series. If the combination has a resistance of 10Ω, what will be the resistance of the thicker wire?
a) 8Ω
b) 10Ω
c) 12Ω
d) 16Ω

Two identical resistors are connected in parallel to a battery. A third resistor of the same value is then connected in series to this combination. If the equivalent resistance of the circuit thus obtained is equal to the resistance of one of the resistors, what will be the ratio of the emf of the battery to the potential difference across one of the resistors?
a) 1:1
b) 2:1
c) 3:1
d) 4:1

Three resistors of 2Ω, 4Ω, and 6Ω are connected in parallel to a battery of emf 12V and negligible internal resistance. What will be the current in the 4Ω resistor?
a) 1A
b) 2A
c) 3A
d) 4A

Two identical resistors are connected in parallel to a battery of emf E and internal resistance r. A third resistor of the same value as the first two is then connected in series to this combination. If the current in the circuit thus obtained is equal to the current when the two identical resistors are connected in series to the same battery, what will be the ratio of the internal resistance of the battery to the resistance of each resistor?
a) 1:1
b) 2:1
c) 3:1
d) 4:1

A wire of resistance R is bent to form a closed square loop. If a current i flows through it, what will be the magnetic moment of the loop?
a) iR
b) 2iR
c) 3iR
d) 4iR

A long solenoid of length l and radius R has n turns per unit length. If a current i flows through it, what will be the magnetic field at a point on the axis of the solenoid at a distance x from one end?
a) μ0in(R^2 + x^2)^(-3/2)
b) μ0inR^2/(R^2 + x^2)
c) μ0inR^2/(R^2 – x^2)
d) μ0in(R^2 – x^2)^(-3/2)

A circular loop of radius R carrying a current i lies in the x-y plane with its center at the origin. What will be the magnetic field at a point on the z-axis at a distance z from the origin?
a) μ0iR^2/2(R^2 + z^2)^(3/2)
b) μ0iR^2/2(R^2 – z^2)^(3/2)
c) μ0iR^2/2(R^2 + z^2)
d) μ0iR^2/2(R^2 – z^2)

A wire of length l carrying a current i is bent to form a circular loop of radius R. What will be the magnetic field at the center of the loop?
a) μ0i/2R
b) μ0iR/2l
c) μ0i/2πR
d) μ0iR^2/2l^3

Two identical circular loops of radius R are placed in the same plane with their centers at a distance d apart. If a current i flows through each loop in the same direction, what will be the magnetic field at a point on the line joining their centers at a distance x from the center of one of the loops?
a) μ0iRx/[(R^2 + x^2)^(3/2)]
b) μ0iRx/[(R^2 + (d – x)^2)^(3/2)]
c) μ0iRx/[(R^2 + d^2 – 2dx)^(3/2)]
d) μ0iR/d^3

Answer: c) μ0iRx/[(R^2 + d^2 – 2dx)^(3/2)]

A straight wire of length l carries a current i. It is bent into the shape of a semicircle. What will be the magnetic field at the center of the semicircle?
a) μ0i/2R
b) μ0iR/l
c) μ0i/2πR
d) μ0iR^2/l^3

A rectangular loop of sides a and b is placed in a uniform magnetic field B with its plane perpendicular to the field. If the loop is rotated by an angle θ about an axis passing through one of its sides and parallel to the magnetic field, what will be the emf induced in the loop?
a) zero
b) B(a^2 – b^2)θ/2
c) B(a^2 + b^2)θ/2
d) B(a^2 – b^2)sinθ

A long wire of circular cross-section carries a current i. What will be the magnetic field at a point on the axis of the wire at a distance r from the center of the wire?
a) μ0i/2r
b) μ0i/2πr
c) μ0i/2r^2
d) μ0i/2πr^2

A wire of length l carrying a current i is bent into the shape of a circular coil of radius R. What will be the magnetic field at a point on the axis of the coil at a distance x from its center?
a) μ0iR^2/2(x^2 + R^2)^(3/2)
b) μ0iR^2/2(x^2 – R^2)^(3/2)
c) μ0iR^2/2(x^2 + R^2)
d) μ0iR^2/2(x^2 – R^2)

A wire of length l carrying a current i is bent to form a circular loop of radius R. If the loop is placed in a uniform magnetic field B perpendicular to its plane, what will be the torque on the loop?
a) zero
b) Bμ0iR^2
c) Bμ0ilR
d) Bμ0i/2

A wire of length l carrying a current i is bent to form a loop in the shape of a regular polygon with n sides. If the loop is placed in a uniform magnetic field B perpendicular to its plane, what will be the torque on the loop?
a) zero
b) Bμ0iR^2 sin(2π/n)
c) Bμ0ilR sin(π/n)
d) Bμ0iR sin(π/n)

A cylindrical wire of radius R carries a current i. What will be the magnetic field at a point P located at a distance R from the axis of the wire?
a) μ0i/2πR
b) μ0iR/2πR^2
c) μ0iR^2/2πR^3
d) μ0i/2πR^2

A wire of length l carrying a current i is bent to form a rectangular loop of sides a and b. If the loop is placed in a uniform magnetic field B perpendicular to its plane, what will be the maximum torque on the loop?
a) Bμ0ia^2/2l
b) Bμ0ib^2/2l
c) Bμ0iab/2l
d) Bμ0ilab/2

A wire of length l carrying a current i is bent to form a circular loop of radius R. What will be the magnetic moment of the loop?
a) iπR^2
b) iR^2
c) iR^3
d) iR^4

A wire of length l carrying a current i is bent to form a loop in the shape of a square. If the loop is placed in a uniform magnetic field B perpendicular to its plane, what will be the maximum torque on the loop?
a) Bμ0il^2/8
b) Bμ0il^2/4
c) Bμ0il^2/2
d) Bμ0il^2

A wire of length l carrying a current i is bent to form a circular loop of radius R. What will be the self-inductance of the loop?
a) μ0πR^2
b) μ0R^2
c) μ0R^3
d) μ0R^4/2l

Two long parallel wires are separated by a distance d and carry currents i and 2i respectively in the same direction. What will be the magnetic field at a point on the line joining the two wires and at a distance r from it?
a) μ0i/2πd
b) μ0i/2πr
c) μ0i/4πd
d) μ0i/4πr

Two long parallel wires are separated by a distance d and carry currents i and 2i respectively in opposite directions. What will be the magnetic field at a point on the line joining the two wires and at a distance r from it?
a) μ0i/2πd
b) μ0i/2πr
c) μ0i/4πd
d) μ0i/4πr