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Electromagnetic Induction question bank (Physics)

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Q1.

Two different coils of self inductance $L_{1}$ and $L_{2}$ are placed close to each other so that the effective flux in one coil is completely linked with other. If $M$ is the mutual inductance between them, then

(A)

$M=L_{1} / L_{2}$

(B)

$M=L_{1} L_{2}$

(C)

$M=\sqrt{L_{1} L_{2}}$

(D)

$M=\left(L_{1} L_{2}\right)^{2}$

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Q2.

Two different coils have self inductance $8 \mathrm{mH}$ and $2 \mathrm{mH}$. The current in both coils are increased at same constant rate. The ratio of the induced emf's in the coil is

(A)

$4: 1$

(B)

$1: 4$

(C)

$1: 2$

(D)

$2: 1$

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