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
The circuit shown in the figure.
Resistance of the ammeter is
By Ohm's law,
Current in the circuit is
Thus the reading in the ammeter will be 0.5 A.