if the switch in primary is on,will the bulb in secondary glow?justify
if the switch in primary is off,what will happen to the magnetic flux in secondary coil.how will this change affect the current and brightness of bulb in secondary coil

Dear Student
A changing current in a coil can induce an e.m.f in a nearby coil.
So if switch is on in primary, an induced e.m.f. will induced in secondary coil and hence bulb will glow.

Now if switch is off in primary coil the direction of an induced emf in secondary coil changes in such that it will always opposes the change that is causing it”. In other words, an induced current will always OPPOSE the motion or change which started the induced current in the first place.
This self-induced emf opposes the change that is causing it and the faster the rate of change of current the greater is the opposing emf. So as switch in primary coil closed instantly so more current will produce and hence brightness of bulb in secondary coil will increase.

Regards
 

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