A square wire loop of 10.0 cm side lies at right angles to a uniform magnetic field of 7T. A 10 V light bulb is in a series with the loop as shown in the figure. The magnetic field is decreasing steadily to zero over a time interval ∆t. For what value of Δtin×10-3sec, the bulb will shine with fuIl brightness?

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answer is 7.

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Detailed Solution

Induced emf should be equal to 10 Ve=AdBdt⇒10=1010027Δt⇒Δt=7ms

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