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24. Electromagnetic Induction question bank (Physics)

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Q1.

A circular coil of radius \(5\,\text{cm}\) has 500 turns of a wire. The approximate value of the coefficient of self-induction of the coil will be

(A)

25 millihenry

(B)

\(25 \times 10^{-3}\,\text{millihenry}\)

(C)

\(50 \times 10^{-34}\,\text{millihenry}\)

(D)

\(50 \times 10^{-3}\,\text{henry}\)

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Q2.

A solenoid has 2000 turns wound over a length of \(0.30\,\text{m}\). The area of its cross-section is \(1.2 \times 10^{-3}\,\text{m}^2\). Around its central section, a coil of 300 turns is wound. If an initial current of 2A in the solenoid is reversed in 0.25 s, then the emf induced in the coil is

(A)

\(6 \times 10^{-4}\,\text{V}\)

(B)

\(4 \times 10^{-3}\,\text{V}\)

(C)

\(6 \times 10^{-2}\,\text{V}\)

(D)

\(48\,\text{mV}\)

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