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WHICH IS THE FORMULA USED IN THIS PROBLEM HERE PLEASE TELL URGENT

WHICH IS THE FORMULA USED IN THIS PROBLEM HERE PLEASE TELL URGENT

Question Image
Grade:12

2 Answers

Mahima Kanawat
1010 Points
3 years ago
Dear student ....The formula used here is the Magnetic field at the centre of circular ring i.e., B=µ0NI/2R.....on solving we get the same answer ....The explanation in the solution is actually the derivation from biot savart law which finally gives B=µ0NI/2R.....With Regards ....Mahima ....(Askiitians Forum Expert )
Khimraj
3007 Points
3 years ago
Magnetic filed due to current current carrying coil on its axis is given by
 
B = (u0/4π)(2πnIr2/(x+ r2)3/2
here we want to calculate B on centre of circle. SO X =0.
Then B = (u0/2)(nl/r).
By putting given values in above formula you will get answer.
Hope it clears. If you like anser please approve it.

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