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.
Answer: E
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Fill in the blank(s) with the appropriate word(s).
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