Question

Assertion (A): At high temperatures, metal wires have a greater chance
of short circuiting.
Reason (R): Both resistance and resistivity of a material vary with
temperature.​

Answer 1

Both assertion and reason is correct . But reason is not correct explanation for assertion.

Explanation:

• At high temperatures, metal wires have a greater chance of short-circuiting.
• This is because both resistance and resistivity of the metal wire vary with temperature.
• Resistance means hindrance in the flow of current. Hight resistance low will be currents and vice versa.
• It increases with an increase in temperature.
• Similarly, resistivity depends on temperature and it also increases with an increase in temperature.