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a coil of 100 turns and area (2÷100)m^2 pivoted about a vertical diameter in a uniform magnatic field carries a current of 5A.when the coil is held with its plane in north south direction it experiences a torque 0.3Nm and in east West direction is 0.4Nm. magnatic field is?? (neglect earth mag fld)


Nasim Parvez 12th Apr, 2020
Answer (1)
Sk Student Expert 22nd May, 2020

Hi

Couple because of attractive field following up on attractive snapshot of the current coil= M X B in

vectors

Couple = M * B * Sin theta

Theta. = point among M and B.

M = I * N*A = 5*10* 0.02 = 1 units

Couple = 0.3 = 1*B*sin theta

Further, wrt East West:

Couple = 0.4 = 1 *B*Cos theta

Figuring out and including we get

B = 0.5 T

Hope it helps

2 Comments
Comments (2)
22nd May, 2020
too late to answer
Reply
Sk
Student Expert 22nd May, 2020
Nasim Parvez Sorry for that
Reply

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