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This mock test of Electromagnetic Induction MSQ for Physics helps you for every Physics entrance exam.
This contains 10 Multiple Choice Questions for Physics Electromagnetic Induction MSQ (mcq) to study with solutions a complete question bank.
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*Multiple options can be correct

QUESTION: 1

Switch ** S** is closed for a long time at

Solution:

Just before opening the switch, the current in the inductor is ε/R. Energy stored in it

This energy will dissipate in the resistors ** R_{1}** and

The correct answers are: total heat produced in resistor

*Multiple options can be correct

QUESTION: 2

A constant force ** F** is being applied on a rod of length

Solution:

as ** ‘a’** is decreasing continuously hence the rate of power delivered by external force will be decreasing continuously.

The correct answers are: the power delivered by force will be constant with time, the power delivered by force will be increasing first and then will decreases, the rate of power delivered by the external force will be increasing continuously

*Multiple options can be correct

QUESTION: 3

In the figure shown ** ‘R’** is a fixed conducting fixed ring of negligible resistance and radius

Solution:

Equivalent circuit :

By nodal equation :

nodal

also direction of current in ‘r’ will be towards negative terminal i.e. from rim to origin.

Alternatively; by equivalent of cells (figure (ii)):

The correct answers are: Current through ** ‘r’** is Direction of current in external

*Multiple options can be correct

QUESTION: 4

In the figure shown, the magnet is pushed towards the fixed ring along the axis of the ring and it passes through the ring. Which of the following is incorrect.

Solution:

When the magnetic goes away from the ring the flux in the ring decreases hence the induced current will be such that it opposes the decreasing flux in it hence ring will behave like a magnet having face ** A** as north pole and face

The correct answers are: when magnet goes towards the ring the face ** B** becomes south pole and the face

*Multiple options can be correct

QUESTION: 5

In the circuit diagram shown

Solution:

At steady state no resistance will be offered by inductor hence, time constant is * L/R* and steady state current in inductor is ε/R.

The correct answers are: time constant is * L/R* , steady state current in inductor is ε/R

*Multiple options can be correct

QUESTION: 6

An ideal inductor, (having initial current zero) a resistor and an ideal battery are connected in series at time ** t = 0**. At any time

Solution:

By principal of energy conservation

Near the starting of the circuit

As di/dt has greater value at the starting of the circuit,

The correct answers are: for all times *t*, only near the starting of the circuit

*Multiple options can be correct

QUESTION: 7

Two straight conducting rails form a right angle where their ends are joined. A conducting bar in contact with the rails starts at the vertex at time ** t = 0** and moves with constant velocity

Solution:

The correct answers are: ** t**,

*Multiple options can be correct

QUESTION: 8

A conducting rod of length *l* is moved at constant velocity **‘ v_{0}’** on two parallel, conducting, smooth, fixed rails, that are placed in a uniform constant magnetic field

Solution:

Rate of work done by external agent is :

and thermal power dissipated in the resistor = *eI* = (*BvL*)*I*

clearly both are equal.

If applied external force is doubled, the rod will experience a net force and hence acceleration. As a result velocity increases.

Since I = e/R

On doubling ** ‘R’,** current and hence required power becomes half.

Since, P = BILv

The correct answers are: The thermal power dissipated in the resistor is equal to rate of work done by external person pulling the rod, If applied external force is doubled than a part of external power increases the velocity of rod, If resistance ** R** is doubled then power required to maintain the constant velocity

*Multiple options can be correct

QUESTION: 9

A circuit consisting of a constant *emf*. ** ‘E’**, a self induction

Solution:

Since curve ** ‘b’** is below curve

The correct answers are: ** E** and

*Multiple options can be correct

QUESTION: 10

A conducting loop rotates with constant angular velocity about its fixed diameter in a uniform magnetic field. Whose direction is perpendicular to that fixed diameter.

Solution:

The correct answers are: The ** emf** will be maximum at the moment when flux is zero, The

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