A circuit contains an ammeter, a batter 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:
Text Solution
Verified by ExpertsThe correct answer is:
D
The circuit is shown in the figure.
Resistance of the ammeter is
(As 
and 
are in parallel)
As ammeter is in series with 
,
∴ Total resistance of the circuit is
By Ohm's law,
Current in the circuit is
Thus the reading in the ammeter will be 
.
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