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

Answer:

a is false r is true this is your answer

Answer 2

Both Assertion (A) and Reason (R) are correct. But Reason (R) is not the correct explanation of Assertion (A).

Explanation:

• When pointing to the insulation between the adjacent wires that are laid in the same channel, then the assertion (a) is true, as high temperatures are the bad foes of the insulating materials.
• Both the resistance and the resistivity depends upon the temperature and the material’s nature.  
• Here, the resistance increases with increase in the given temperature of the conductor. On the other hand, resistivity of the metal increases with the increase in temperature (but for semiconductor, it tends to decrease).

To know more about characteristics of metallic wires,

1) Why are metal wires used to carry electricity?

https://brainly.in/question/2984381

2) Two metal wires have the resistivity 1.62 × 10-8 ohm meter and 4.68 × 10-8 ohm meter .Comapre the resistance if A is twice long as B and half of its diameter

https://brainly.in/question/7755654