Question

A and B are two wires of same metal. If length of
wire B is twice the length of wire A and the area
of cross section of wire B is 1/4 time that of wire
A. Then which of the following is the ratio of
resistance of wire A to that of wire B?
O 18

Answer 1

Answer:

Correct option is D)

Because wire B has twice the radius, it has four times the cross-sectional area of wire A. For wire A, R

A

=R=ρL/A. For wire B, R

B

=ρ(2L)/(4A)=(1/2)ρL/A=R/2

Explanation:

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