A wire of 5Ω resistance is drawn out so that its new length is two
PHYSICS
JAMB 2003
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
Correct Answer: B. 20Ω
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