Q. The resistance of a wire is 2 ohms. if the diameter of the wire is reduced to half, keeping the length same, then the resistance of the new wire will be?

A
1 ohm
B
2 ohm
C
4 ohm
D
8 ohm
Solution:

when the diameter is reduced to half without changing the length the resistance will become four-times so the new resistance will be 8 ohm

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