1.

A 100% efficient transformer has 100 turns in the primary and 25 turns in its secondary coil. If the current in the secondary coil is 4 amp, then the current in the primary coil is         [MP PMT 1990]

A.            1 amp    
B.            4 amp
C.            8 amp    
D.            16 amp
Answer» B.            4 amp


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