Physics > 2003 > 32
JAMB UTME
A wire of 5Ω resistance is drawn out so that its new length is two times the original length. If the resistivity of the wire remains the same and the cross sectional area is halved, the new resistance is
A.
40Ω
B.
20Ω
C.
10Ω
D.
5Ω
Answer: B
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