In the circuit above R is a resistor whose resistance increases with an increase in temperature L1 and L2 are identical lamps. If the temperature of R increases?

A. L1 becomes brighter and L2 becomes dimmer
B. L1 becomes brighter and L2 does not change
C. L2 becomes dimmer and L1 does not change
D. L1 becomes dimmer and L2 does not change
E. L1 and L2 becomes brighter

Correct Answer:

Option A – L1 becomes brighter and L2 becomes dimmer