A battery of electromotive force (e.m.f.) $12V$ and negligible internal resistance is connected to a fixed resistor of resistance $40\Omega$ and a thermistor of resistance $R_T$, as shown.
Initially, the temperature of the thermistor is $15^\circ C$ and the current in the circuit is $0.10A$.
The temperature of the thermistor then changes, which causes the current to increase to $0.12A$.
How does the temperature of the thermistor change and what is $R_T$ at the new temperature?
A
2 )
B
3 )
C
4 )
D
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