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
2 
B
1 A
C
0.5 
D
0.25 
Text Solution
Verified by ExpertsThe correct answer is:
C
The circuit is shown in the figure.
Resistance of the ammeter is
(As 480 
and 20 
are in parallel)
As ammeter is in series with 40.8 
Total resistance of the circuit is
By Ohm’s law,
Current in the circuit is
Thus the reading in the ammeter will be 0.5A
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