Question

Assertion (A): The resistance of an ohmic current increases with the rise in temperature.

Reason (R): Ohm's law cannot be verified at higher temperatures.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

• Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

• Assertion (A) is false, but Reason (R) is true.

• Assertion (A) is true, but Reason (R) is false.

Answer 1

Assertion (A) is true, but Reason (R) is false.

Explanation:

For ohmic metallic conductors, resistance increases with a rise in temperature. However, the reason is false: Ohm's law can be verified at a constant temperature, even if that temperature is high. Ohm's law fails when physical conditions like temperature are not kept constant, not simply because the temperature is high.