Question

Assertion : When a wire is stretched to three times its length, its resistance becomes 9

                        times.

   Reason: Resistance is directly proportional to length of wire.                                           (1)

a) Both assertion and reason are true and reason is the correct explanation of assertion

b) Both assertion and reason are true and reason is not the  correct explanation of assertion

c) Assertion is true but reason is false

d) Assertion is false but reason is true​

Answer 1

D)Assertion is false but reason is true​

It is so because when a wire is stretched for three times its resistance will also be three because length is directly proportional to resistance and does it will not increase by 9 times and that's why the assertion is false but reason is true

Answer 2

Answer:

(a)

Explanation:

This is because when the length of wire is streched 3 times, the area of wire will also get reduced by 3 times because the wire is not tripled, it's stretched.