A narrow copper wire of length L and radius b is attached to a wide copper wire of length L and radius 2b,forming one long wire of length 2L.This long wire is attached to a battery,and a current is flowing through it.If the electric field in the narrow wire is E,the electric field in the wide wire is
A) E.
B) 2E.
C) 4E.
D) E/2.
E) E/4.

Question

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The Answer of A narrow copper wire of length L and radius b is attached to a wide copper wire of length L and radius 2b,forming one long wire of length 2L.This long wire is attached to a battery,and a current is flowing through it.If the electric field in the narrow wire is E,the electric field in the wide wire is
A) E.
B) 2E.
C) 4E.
D) E/2.
E) E/4.

A Narrow Copper Wire of Length L and Radius B