Physics

Problem

47. Wire

Y

is made of the same material but has twice the diameter and half the length of wire

X

. If wire

X

has a resistance of

R

then wire Y would have a resistance of (A)

R / 8

(B)

R

(C)

2 R

(D)

8 R

(A)

R / 8

(B)

R

(C)

2 R

(D)

8 R