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A circuit contains an ammeter, a battery...

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

A

`1A`

B

0.5 A

C

0.25 A

D

`2A`

Text Solution

Verified by Experts

The correct Answer is:
B

`R_(eq)=40.8+(480xx20)/(500)`
`=40.8+19.2`
`=60Omega`
`I=(30)/(60)=0.5`amp
So reading of ammeter=0.5 amp
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