NEET Physics Current Electricity Questions Solved

NEET - 2015

A circuit contains an ammeter, a battery of 30 V and a resistance 40.8Ω all connected in series. If the ammeter has a coil of resistance 480Ω  and a shunt of 20Ω then reading in the ammeter will be

(a) 0.5A

(b) 0.25A

(c) 2A

(d) 1A

Effective resistance of a circuit 

Reff=40.8+480 x 20/480 + 20


So,current flowing across ammeter,


Hence,reading of ammeter=0.5A

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