A cylindrical graphite resistor has length L and cross-sectional area A
PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
62. A cylindrical graphite resistor has length L and cross-sectional area A . It is to be placed into a circuit, but it first must be cut in half so that the new length is 1/2L. What is the ratio of the new resistivity to the old resistivity of the cylindrical resistor?
(A) 4
(B) 2
(C) 1
(D) 1/2