1.

Transformation ratio of one transformer is 1:2. If Leclanche cell having emf 1.5 V is connected to primary coil of a transformer then voltage obtained across its secondary is ………..

Answer»

3 V
1.5 V
0.75 V
0

Solution :Because Leclanche cell is a D.C. supply and so it gives constant voltage to primary which does not change its MAGNETIC FLUX and so no EMF is INDUCED across secondary because
`epsilon_2=-M(dI_1)/(dt)=0 "" (because (dI_1)/(dt)=0)`


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