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.
Answers
Answered by
8
Both the assertion and reason is correct
Explanation:
- At high temperatures metal wires have greater chance of short circuiting because both resistance and resistivity of a metal wire varies with temperature.
- Resistance is the property of a substance by virtue of which it opposes the flow of current through it is known as the resistance.
- It is directly propotional to temperature.
- While resistivity is an intrinsic property do not depend on size and shape but do depend on temperature for metals it increases with increase in temperature.
Answered by
5
The assertion and reason are correct.
- At high temperature, there will be more resistance as they are proportional to each other.
- As increase in resistance, which means there is more collision of the electrons in the wire and less current will flow.
- This leads to heat generation and make short circuiting
- The resistance and resistivity depends upon the material and with the variation there is change in the properties of them.
- Like the temperature, both increase with increase of temperature and decrease with the decrease of temperature.
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