Question

How the resistance of a conductor changed when it is streched to double ?

Answer 1

Resistance = Resistivity * (length/cross-sectional area)

Now after stretching it to double of its length the new length is = 2 * length

And the cross-sectional is reduced by say m hence new cross-sectional area is = cross-sectional area / m

Therefore, new resistance = resistivity * (2*length/ (cross-sectional area / m))

= Resistivity *2 *m *(length/ cross-sectional area)

= 2*m * old resistance

Answer 2

As resistance is directly proportional to length of conductor so if u stretch the conductor to its double the resistance will also be increased to double....Moreover on stretching the conductor its area of criss section is also reduced thereby increasing resistance....So all that is the resistance increas...to double...mark brainiest