Masses of three pieces of wires made of the same metal are in the ratio 1 : 3 : 5 and their lengths are in the ratio 5 : 3 : 1. The ratios of their resistances are
A. 1 : 3 : 5
B. 5 : 3 : 1
C. 1 : 15 : 125
D. 125 : 15 : 1
Answer:D
Masses of three pieces of wires made of the same metal are in the ratio 1 : 3 : 5 and their lengths are in the ratio 5 : 3 : 1. The ratios of their resistances are
A. 1 : 3 : 5 B. 5 : 3 : 1 C. 1 : 15 : 125 D. 125 : 15 : 1