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JEE • PHYSICS • ELECTRO MAGNETIC INDUCTION

Electro magnetic induction practice · Easy

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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1 Easy

1 of 14

Understanding +4 | -1

If the coils of a transformer are made up of thick wire, then

View answer and explanation

Correct option: D

Joule’s heating loss is reduced

Option D (Joule’s heating loss is reduced) is correct because a thick wire has lower resistance, leading to reduced Joule heating loss (

I^2R

2 Easy

2 of 14

Application +4 | -1

The coefficient of self inductance of a solenoid is 0.18 mH. If a rod of soft iron of relative permeability 900 is inserted, then the coefficient of self inductance (in mH ) will become nearly:

View answer and explanation

Correct option: A

162

Option A (162) is correct because the self-inductance increases proportionally to the relative permeability when a soft iron rod is inserted.

3 Easy

3 of 14

Understanding +4 | -1

When the rate of change of current is unity, induced emf is equal to

View answer and explanation

Correct option: C

Coefficient of self-induction

Option C (Coefficient of self-induction) is correct because the induced emf is equal to the coefficient of self-induction when the rate of change of current is unity.

4 Easy

4 of 14

Understanding +4 | -1

Assertion: A metallic surface is moved in and out in magnetic field then emf is induced in it.
Reason: Eddy current will be produced in a metallic surface moving in and out of magnetic field.

View answer and explanation

Correct option: B

If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion

Option B (If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion) is correct because while both statements are true, the eddy currents are a consequence of the induced EMF, not the cause of it.

5 Easy

5 of 14

Remembering +4 | -1

Mutual inductance of two coils can be increased by

View answer and explanation

Correct option: B

Increasing the number of turns in the coils

Option B (Increasing the number of turns in the coils) is correct because mutual inductance is directly proportional to the number of turns in the coils.

6 Easy

6 of 14

Remembering +4 | -1

The magnitude of induced emf is directly proportional to the rate of change of magnetic flux linked with the coil. This statement is known as

View answer and explanation

Correct option: C

Faraday's law

Option C (Faraday's law) is correct because Faraday's law of electromagnetic induction states that the induced EMF is directly proportional to the rate of change of magnetic flux.

7 Easy

7 of 14

Remembering +4 | -1

Faraday's law among the following is ____

View answer and explanation

Correct option: C

\oint \mathrm{E} \cdot \mathrm{dl}=\frac{-\mathrm{d} \phi_{\mathrm{B}}}{\mathrm{dt}}

Option C (

\oint \mathrm{E} \cdot \mathrm{dl}=\frac{-\mathrm{d} \phi_{\mathrm{B}}}{\mathrm{dt}}

) is correct because it represents Faraday's law of induction, relating the induced electromotive force to the rate of change of magnetic flux.

8 Easy

8 of 14

Understanding +4 | -1

Eddy current are produced when

View answer and explanation

Correct option: A

metal is kept in varying magnetic field

Option A (metal is kept in varying magnetic field) is correct because eddy currents are induced in a conductor when it experiences a changing magnetic field.

9 Easy

9 of 14

Understanding +4 | -1

The relation between the charge flow

\Delta \mathrm{Q}

through the circuit of resistance

\mathrm{r}

and the change in the magnetic flux

\Delta \phi_{\mathrm{B}}

View answer and explanation

Correct option: A

\Delta \mathrm{Q}=\frac{\Delta \phi_{\mathrm{B}}}{\mathrm{r}}

Option A (

\Delta Q=\frac{{\Delta \phi_B}}{{r}}

) is correct because the charge flow is related to the change in magnetic flux and resistance by this equation, derived from Faraday's law and Ohm's law.

10 Easy

10 of 14

Application +4 | -1

Current in a coil changes from

\mathrm{5}\,\,\mathrm{A}

\mathrm{10}\,\,\mathrm{A}

\mathrm{0}.\mathrm{2}\,\,\mathrm{s}

. If the coefficient of self-induction is

\mathrm{10}\,\,\mathrm{H}

, then the induced emf is

View answer and explanation

Correct option: B

\mathrm{250}\,\,\mathrm{V}

Option B (

\mathrm{250}\,\mathrm{V}

) is correct because it's calculated directly using the formula for induced emf,

e = L \frac{{dI}}{{dt}}

11 Easy

11 of 14

Understanding +4 | -1

The induced emf cannot be produced by:

View answer and explanation

Correct option: D

Maintaining large but constant current in a circuit

Option D (Maintaining large but constant current in a circuit) is correct because a constant current produces a constant magnetic field, which does not induce an EMF.

12 Easy

12 of 14

Remembering +4 | -1

An electric generator is based on ______

View answer and explanation

Correct option: A

Faraday’s laws of electromagnetic induction

Option A (Faraday’s laws of electromagnetic induction) is correct because an electric generator operates based on the principle of electromagnetic induction, where a changing magnetic field induces an electromotive force (EMF) and generates electric current.

13 Easy

13 of 14

Understanding +4 | -1

When you walk through a metal detector carrying a metal object in your pocket, it raises an alarm. This phenomenon works on:

View answer and explanation

Correct option: B

Resonance in ac circuits

Option B (Resonance in ac circuits) is correct because metal detectors utilize the principle of resonance in AC circuits to detect the presence of metal objects.

14 Easy

14 of 14

Analyzing +4 | -1

Statement I: No current is induced in a metal loop if it is rotated in an electric field.

Statement II: The electric flux through the loop does not change with time.

View answer and explanation

Correct option: C

Statement I is true; Statement II is false

Option C (Statement I is true; Statement II is false) is correct because no current is induced in a metal loop rotated in an electric field, but the electric flux does change with time.

Revision notes and key takeaways

Review ELECTRO MAGNETIC INDUCTION in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 14 single-correct-answer MCQs on ELECTRO MAGNETIC INDUCTION.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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