A circular coil of radius 8 cm with curr...

A circular coil of radius 8 cm with current 6 A has 30 turns. It is suspended vertically in a uniform horizontal magnetic field of 1 T. which makes an angle of `60^@` with normal of the coil. The magnitude of counter torque applied to prevent the coil from turning will be:

3 N-m

3.9 Nm

3.133 Nm

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A circular coil of 70 turns and radius 5 cm carrying a current of 8 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.5 T. The field lines make an angle of 30^(@) with the normal of the coil then the magnitude of the counter torque that must be applied to prevent the coil from turning is

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A circular coil of 100turns radius 10cm, carries a current of 5A. It is suspended vertically in a uniform horizontal magnetic field of 0.5T and the field lines make an angle of 60^(@) with the plane of the coil. The magnitude of the torque that must be applied on it to prevent it from turning is

A circular coil of 30 turns and radius 8.0cm carrying a current of 6.0A suspended vertically in a uniform horizontal magnetic field of magnitude 1.0T . The field lines makes an angle of 60^(@) with the normal of the coild. Calculate the magnitude of the counter torque that must be applies to prevent the coil form turning.

A rectangular coil of n turns each of area A, carrying current I, when suspended in a uniform magnetic field B, experiences a torque tau=nIBAsin theta where theta is the angle with a normal drawn on the plane of coil makes with the direction of magnetic field. This torque tends to rotate the coil and bring it in equilibrium position. In stable equilibrium state, the resultant force on the coil is zero. The torque on coil is also zero and the coil has minimum potential energy. Read the above passage and answer the following questions: (i) In which position, a current carrying coil suspended in a uniform magnetic field experiences (a) minimum torque and (b) maximum torque? (ii) A circular coil of 200 turns, radius 5cm carries a current of 2*0A . It is suspended vertically in a uniform horizontal magnetic field of 0*20T , with the plane of the coil making an angle of 60^@ with the field lines. Calculate the magnitude of the torque that must be applied on it to prevent it from turning. (iii) What is the basic value displayed by the above study?

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