Question

How much does the resistance change if length of the wire is doubled and its cross - sectional area is reduced to half?​

Answer 1

Answer:

Therefore , if you double the Length of wire and halved its radius , The Resistance increases 8 times of its usual Resistance.

Answer 2

Explanation:

resistance R = rL/A ( r is constant for given wire, called resistivity)

R'= r*2L/ A/2 = 4rL/A= 4R

so it increased 4 times