A metal wire of circular cross-section has a resistance R₁. The wire is now stretched without breaking, so that its length is doubled and the density is assumed to remain the same. If the resistance of the wire now becomes R₂, then R₂:R₁ is

Options

(a) (1:1)
(b) (1:2)
(c) (4:1)
(d) (1:4)

Correct Answer:

(4:1)

Explanation:

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