Assertion(A)-The resistance of the conductor rises as the temperature rises.
Reasons(R)- The inverse of conductivity is called resistivity.

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Both A and R are true, and R is the correct explanation of A.

Both A and R are true, but R is not the correct explanation of A.

A is true. Still, R is false.

Both A and R are false.

answer is A.

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Detailed Solution

The conductivity of the conductor decreases with the increase in temperature because when the temperature is increased, the kinetic energy of the electrons in the element increases, increasing the movement of the electrons as a whole which opposes the flow of the electrons, and the conductivity decreases. Resistivity is the reciprocal of conductivity; hence, resistance increases when the temperature increases.

Hence option (a) both A and R are true, and R is the correct explanation of A is correct.

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