JEE PHYSICS MCQ: CURRENT ELECTRICITY

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Application +4 | -1

A wire of resistance

4 \Omega

is used to wind a coil of radius

7 \mathrm{~cm}

. The wire has a diameter of

1.4 \mathrm{~mm}

and the specific resistance of its material is

2 \times 10^{-7} \Omega m

. Find the number of turns in the coil.

View answer and explanation

Correct option: A

n =70

Option A (

n =70

) is correct because it is the number of turns calculated using the resistance, specific resistance, and dimensions of the wire.

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