Questions

What will be the magnitude of magnetic induction at the centre oi a square loop of side l, if a current i is flowing in the loop ?

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22μ0iπl

μ0iπl

22μ0il

2μ0iπl

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detailed solution

Correct option is A

The magnetic induction due to the loop at O isB= 4x BABHere BAB= μ0i4π(l/2)sin⁡45∘+sin⁡45∘=2μ0i4πl×12+12=22μ0i4πl∴ B=4×BAB=4×22μ0i4πl=22μ0iπl

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