A Narrow Copper Wire of Length L and Radius B

Multiple Choice

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.