Explanation
Current in B1 will promptly become zero while current in B2 will slowly tend to zero.
In a generator e.m.f. is induced according as Lenz’s rule
Transformer does'nt work on dc.
When the secondary coil circuit is open, the magnetic flux in the core is produced by the primary current only. When the secondary circuit is closed, the currents in the secondary coil also produce magnetic flux in the core but in opposite direction. This decreases the core flux and hence reduces the back e.m.f. more current is drawn in the primary coil. Hence, power factor is no longer zero. The power factor has increased or the phase difference is no longer 90o, i. e., phase difference has decreased. Thus, dynamic resistance has increased.
If electron is moving from left to right, the flux linked with the loop (which is into the page) will first increase and then decrease as the electron passes by. So the induced current in the loop will be first anticlockwise and will change direction as the electron passed by.
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