(A): An electric heater is heated first by direct and then by alternating currents. For both the currents, the potential difference across the ends of the heater is the same. The rate of production of heat will be different in two cases.
(R): The resistance of a coil in alternating cur- rent will be more than the resistance of a coil in direct current, hence heat produced in case of direct current will be high.

Options

A. Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.
B. Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'
C. 'A' is true and 'R' is false
D. Both 'A' and 'R' are false

Answer

A