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# Question 13: NCERT Solutions for 12th Class Physics: Chapter 4-Moving Charges and Magnetism

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Question 13: NCERT Solutions for 12th Class Physics: Chapter 4-Moving Charges and Magnetism

(a) A circular coil of 30 turns and radius 8.0 cm carrying a current of 6.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 60° with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning.
(b) Would your answer change, if the circular coil in (a) were replaced by a planar coil of some irregular shape that encloses the same area? [All other particulars are also unaltered].

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1. Solution:
(a) The given coil is circular and is suspended such that field lines makes angle 60° with normal of the coil.A similar torque is required to prevent the coil from turning. A similar torque is required to prevent the coil from turning.
(b) As long as the area of the planar coil remains same, the torque on the coil is also same, irrespective of the shape.

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NCERT Solutions for 12th Class Physics: Chapter 4-Moving Charges and Magnetism

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