Question

4.
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

Answer:

Explanation:

Assertion and reason both are true but reason is not the correct explanation of the assertion.

Because at high temperatures heat increases so current increases but resistance decreases as R is inversely proportional to I.

May this answer helps u

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Answer 2

Both assertion and reason are true but reason is not the correct explanation of the assertion.

Explanation:

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.​

• Both assertion and reason are true but reason is not the correct explanation of the assertion.
• Because at high temperatures voltage increases.
• From Ohm's law we can say that V = I R
• As voltage is directly proportional to current so when voltage increases the current also increases, but resistance decreases as R is inversely proportional to current.