Assertion (A): At high temperatures, metal wires have a greater chanceof short circuiting.Reason (R): Both resistance and resistivity of a material vary withtemperature.
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Assertion is true and its reason is also true
Explanation:
- Resistance and resistivity of any material changes with temperature it depends on the coefficient of temperature
- In conductors resistance and resitivity decreases with increase in temperature and in insulators it reduces with rise in temperature
- As given in assertion the wire is metal so its resistance and resistivity reduces hence there are more chances to get fused or melt to short circuit hence the assertion and reason both are true
- But if there would me any non metal or insulator at the place of given metal metal then both resistance and resistivity increases
To know more about resistivity and resistance, visit:
Define resistivity of material
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