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Electromagnetic Induction MCQs for NEET — Physics Questions with Answers

Practice free Electromagnetic Induction (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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Two different loops are concentric & lie in the same plane. The current in outer loop is clockwise & increasing withtime. The induced current in the inner loop then, is

A. clockwise B. zero C. counter clockwise D. direction depends on the ratio of loop radii

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Explanation

According to Lenz's law, the direction of the induced current is such that it opposes the change in magnetic flux that caused it. Since the current in the outer loop is increasing clockwise, the magnetic field due to this current is increasing out of the plane. To oppose this increase, the induced current in the inner loop must create a magnetic field into the plane. Hence, the induced current in the inner loop must be counterclockwise.

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A magnetic field $2 \times 10^{-2} T $ acts at right angles to a coil of area $200 cm^2$ with 25 turns. The average emf induced in the coil is 0.1 v when it removes from the field in time t. The value of t is

A. 0.1 sec B. 1 sec C. 0.01 sec D. 20 sec

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A coil has an area of $0.05 m^2$ & it has 800 turns. It is placed perpendicularly in a magnetic field of strength , $4 \times 10^{â€“5} Wb/m^{-2}$. It is rotated through $ 90 ^\circ $ in 0.1 sec. The average emf induced in the coil is...

A. 0.056v B. 0.046v C. 0.026v D. 0.016v

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A coil having n turns & resistance $ R \Omega $ is connected with a galvanometer of resistance $ 4 R \Omega $ . This combination is moved from a magnetic field $W_1 Wb$ to $W_2$ Wb in t second. The induced current in the circuit is....

A. $ -{ (W_2 -W_1) \over 5Rnt} $ B. $ -n{ (W_2 -W_1) \over 5Rt} $ C. $ -{ (W_2 -W_1) \over Rnt} $ D. $ -n{ (W_2 -W_1) \over Rt} $

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When a train travels with a speed $360 km h^{-1} $ along the track separated by 1 meter. The vertical component of earth's magnetic field is $ 0.1 \times 10^{-4} T $ . What is the value of induced emf between the rails ?

A. $ 10^{-2} V $ B. $ 10^{-4} V $ C. $ 10^{-3} V $ D. 1V

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A circular loop of radius R carrying current I lies in X-Y plane with its centre at origin. The total magnetic flux through x-y plane is.....

A. Directly proportional to I B. Directly proportional to R C. Directly proportional to $R^2$ D. Zero

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Explanation

The total magnetic flux through the plane of the circular loop is zero because the magnetic field lines produced by the current in the loop are symmetric with respect to the plane of the loop. Since the loop lies in the X-Y plane, the net magnetic flux through this plane is zero.

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Two similar circular loops carry equal currents in the same direction.On moving the coils further apart, the electric current will

A. Remain unchanged B. Increasing in both C. Increasing in one decreasing in other D. Decreasing in both

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Explanation

Oppose any change

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When the number of turns in a coil is make four time without anychange in length of the coil, its self inductance becomes......

A. unchanged B. two times C. four times D. sixteen times

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Explanation

The self-inductance of a coil is directly proportional to the square of the number of turns. If the number of turns is made four times without any change in the length of the coil, the self-inductance becomes 4^2 = 16 times. Therefore, the self-inductance becomes sixteen times.

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A metal rod moves at a constant velocity in a direction perpendicular to its length & a constant uniform magnetic field too. Select the correct statement (s) from the following.

The entire rod is at the same electrical potential

There is an electric field in the rod

The electric potential is highest at the centre of the rod.

The electric potential is lowest at the centre of the rod.

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Explanation

When a metal rod moves in a direction perpendicular to its length and a uniform magnetic field, an electromotive force (emf) is induced in the rod. This creates an electric field within the rod. Hence, there is an electric field in the rod.

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Two co-axial solenoids are made by a pipe of cross sectional area $10 cm^2$ and length 20 cm If one of the solenoid has 300 turns and the other 400 turns, their mutual inductance is........

A. $ 4.8 \phi \times 10^{-4} H $ B. $ 4.8 \phi \times 10^{-5} H $ C. $ 2.4 \phi \times 10^{-4} H $ D. $ 4.8 \phi \times 10^{4} H $

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