A Copper Wire of Length L and Radius B Is

question 29

Multiple Choice

A copper wire of length L and radius b is attached to another 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.Relative to the electric field within the wire of radius b,the magnitude of the electric field within the wire of radius 2b is

• A)four times weaker.
• B)four times stronger.
• C)two times weaker.
• D)two times stronger.
• E)equal.

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