A varying current in a coil changes from 10 A to 0 in 0.5 sec , if the average emf induced in the coil is 220 V , the self-inductance of the coil equals \( \qquad \) (A) 5 H (B) 6 H (C) 11 H (D) 12 H
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5 \, \text{s} \) - Average induced emf, \( \mathcal{E} = 220 \, \text{V} \) Show more…
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In a coil when current changes from $10 \mathrm{~A}$ to $2 \mathrm{~A}$ in time $0.1 \mathrm{~s}$, induced EMF is $3.20 \mathrm{~V}$. The self-inductance of coil is (A) $4 \mathrm{H}$ (B) $0.4 \mathrm{H}$ (C) $0.04 \mathrm{H}$ (D) $5 \mathrm{H}$
When current in a coil changes from $2 \mathrm{~A}$ to $-2 \mathrm{~A}$ in $0.05 \mathrm{~s}$, an emf of $8 \mathrm{~V}$ is induced in the coil. The coefficient of self-inductance of the coil is (a) $0.1 \mathrm{H}$ (b) $0.2 \mathrm{H}$ (c) $0.4 \mathrm{H}$ (d) $0.8 \mathrm{H}$
Electromagnetic Induction and Alternating Current
Round 1
When the current changes from $+2 \mathrm{~A}$ to $-2 \mathrm{~A}$ in $0.05 \mathrm{~s}$, an emf of $8 \mathrm{~V}$ is induced in a coil. The coefficient of self-induction of the coil is : (a) $0.1 \mathrm{H}$ (b) $0.2 \mathrm{H}$ (c) $0.4 \mathrm{H}$ (d) $0.8 \mathrm{H}$
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