Question

Assertion: At high Temperature, metal wires have greater chance of short circuiting. Reason:Both resistance and resistivity vary with temperature.
My Answer - (A) is false ,but (R) is true.
Beacuse i thought short circuit is due to large flow of electron due to large flow of electron ,heat dissipiated not short circuit create heat , it is huge electron flow.
If I am wrong the give appropriate explanation.​

Answer 1

Both assertion and reason are correct.  

Explanation:

• Both assertion and reason are correct.  
• But the reason is not the correct explanation for the assertion.
• When the temperature is higher the flow of electrons increases.  
• The increase in flow causes the more dissipation of heat which melts the insulation of wires and the wire may face short-circuiting.
• Similarly, resistance and resistivity also vary with temperature. An increase in resistance increases the temperature.

Answer 2

Answer:

Assertion is false and Reason is true

Explanation:

it does not matter whether the temp. increases as short-circuit occurs only when live and neutral wire touches each other.. so, temp. can't be taken as the factor affecting the short circuit

Reson: it is true as both resistance and resistivity varies with temp.