Electromagnetic Induction

Faraday, Lenz, and mutual induction basics. Ideal for students preparing board exams and competitive tests.

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QUESTION NO 01

Faraday's law relates induced emf to?

Answer: Rate of change of magnetic flux

ε = −dΦ_B/dt.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 02

Lenz's law says induced current?

Answer: Opposes the change causing it

Induced effects oppose the change in flux (energy conservation).

Shahzad Mahota @shahzad-mahota

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QUESTION NO 03

SI unit of magnetic field (B) is?

Answer: Tesla

SI unit of B is the tesla (T); 1 T = 1 Wb/m².

Shahzad Mahota @shahzad-mahota

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QUESTION NO 04

Power dissipated in a resistor is?

Answer: I²R

P = I²R = V²/R = VI.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 05

Kirchhoff's junction rule is based on conservation of?

Answer: Charge

ΣI = 0 at a junction — charge conservation.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 06

Kirchhoff's loop rule is based on conservation of?

Answer: Energy

ΣΔV = 0 around a closed loop — energy conservation.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 07

A transformer works on the principle of?

Answer: Mutual induction

Transformers use mutual electromagnetic induction between coils.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 08

Dielectric constant of vacuum is?

Answer: 1

Relative permittivity of free space κ = 1.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 09

Drift velocity of electrons in a conductor is typically?

Answer: Very small (mm/s order)

Drift speeds are usually millimetres per second; signal propagation is much faster.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 10

Two resistors in series have equivalent resistance?

Answer: Sum of individual resistances

R_eq = R₁ + R₂ for series connection.

Shahzad Mahota @shahzad-mahota

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@shahzad-mahota

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Electromagnetic Induction

Faraday's law relates induced emf to?

Lenz's law says induced current?

SI unit of magnetic field (B) is?

Power dissipated in a resistor is?

Kirchhoff's junction rule is based on conservation of?

Kirchhoff's loop rule is based on conservation of?

A transformer works on the principle of?

Dielectric constant of vacuum is?

Drift velocity of electrons in a conductor is typically?

Two resistors in series have equivalent resistance?

Published By

Shahzad Mahota

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00

00

00

00

00

Electromagnetic Induction

Faraday's law relates induced emf to?

Explanation

Lenz's law says induced current?

Explanation

SI unit of magnetic field (B) is?

Explanation

Power dissipated in a resistor is?

Explanation

Kirchhoff's junction rule is based on conservation of?

Explanation

Kirchhoff's loop rule is based on conservation of?

Explanation

A transformer works on the principle of?

Explanation

Dielectric constant of vacuum is?

Explanation

Drift velocity of electrons in a conductor is typically?

Explanation

Two resistors in series have equivalent resistance?

Explanation

Published By

Shahzad Mahota

00

00

00

00

00

00

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