If a certain piece of copper is to be shaped into a conductor of minimum resistance, its length (and cross-sectional area A shall be respectively
A. L/3 and 4 A
B. L/2 and 2 A
C. 2L and A2
D. L and A
Answer:A
If a certain piece of copper is to be shaped into a conductor of minimum resistance, its length (and cross-sectional area A shall be respectively
A. L/3 and 4 A B. L/2 and 2 A C. 2L and A2 D. L and A