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Magnetic flux passing through a coil is ...

Magnetic flux passing through a coil is initially `4xx 10^-4` Wb. It reduces to 10% of its original value in t second. If the emf induced is 0.72 mV then t in second is

A

`0.3`

B

`0.4`

C

`0.5`

D

`0.6`

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The correct Answer is:
C
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