A wire has a length of 2 m and a cross-sectional area of 1 mm², resulting in a resistance of 5 Ω. If the wire is cut in half, what will be the new resistance?

2.5 Ω

5 Ω

10 Ω

1 Ω

Answer and Solution

A. 2.5 Ω

When the length is halved, resistance is also halved: R_new = 5Ω/2 = 2.5 Ω.

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