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A metallic ring, having area $1 m^{2}$ and resistance $10 Ω$ is held in a uniform magnetic field of induction $2 μ T$ with its plane perpendicular to the field. If the field is switched off in a time interval of 0.1 second, then the average current induced is

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2 $μ A$

4 $μ A$

0.5 $μ A$

10 $μ A$

answer is A.

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Detailed Solution

$ε =$ Average induced emf

$= \frac{1 \times 2}{0.1} μ V = 20 μ V$

$∴$ Average current $I = \frac{20}{10} μ A = 2 μ A$ .

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