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Q.

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

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a

1 A

b

0.5 A

c

2 A

d

0.25 A

answer is B.

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Detailed Solution

Question Image

(or)
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R1=480×20480+20=19.2Ω
i=VR1+R=3019.2+40.8=0.5A

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