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Question

When a uniform copper wire is closely wound on a scale , it occupies 2 cm for 50 turns. The radius of the wire is

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Solution

2 cm for 50 turns
2/50 cm for 1 turn
1/25 = 0.04 cm for 1 turn

Which means 0.04 cm is required for 1 turn which implies the dimeter of the wire is 0.04cm
So the radius of the wire is 0.04 / 2 = 0.02cm

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