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A piece of wire of resistance 20 ohm is drawn out as that its length is increased to twice its original length .calculate new resistance.And resistivity

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Answer:

A piece of wire of resistance 20Ω is DRAWN so that its length is increased to twice is original length. CALCULATE resistance of the wire in the new situation. R=ρlA or 20Ω=ρlA. When the length becomes 2L and cross-sectional AREA is A/2.

Explanation:

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