Determine the rate of change of flux - magnetic field, Physics

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An e.m.f. of 25V is induced in a coil of 300 turns when the flux linking with it alters by 12mWb. Find the time, in milliseconds, in which the flux makes the change.

An ignition coil having 10000 turns has an e.m.f. of 8 kV induced in it?

 What rate of change of flux is needed for this to happen?

 


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