If the outer coil of the precious problem is rotated through 90^@ about a diameter, what would be the magnitude of the magnetic field B at the centre ?

(i) Two circular coils of raddii 5.0 cm and 10 cm carry equla currents of 1 A .The coils have 50 and 100 turns respectively and are placed in such a way that their planes as well as the centre coincide.Find the magnitude of the magnetic field B at the common centre when the currents in the coils are (a) in the same sense ,(b) in the opposite sense. (ii) If the outer coil of the above problem is rotated through 90^(@) about a diameter,what would be the magnitude of the magnetic field B at the centre?

Consider a closely wound 1000 turn coil having a radius of lm. If a current of 10A basses through the coil, what will be the magnitude of the magnetic field at the centre?

A 100 turn closely wound circular coil of radius 10 cm carries a current of 3.2.A. (a) What is the field at the centre of the coil ? (b) What is the magnetic moment of this coil ? The coil is placed in vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A uniform magnetic field of 2T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coil rotates through an anlge of 90^(@) under the influence of the magnetic field. (c) What are the magnitudes of the torques on the coil in the initial and final position ? (d) What is the angular speed acquired by the coil when it has rotated by 90^(@) ? The moment of inertia of the coil is 0.1 kg m^(2)

A 100 turn closely wound circular coil of radius 10 cm carries a current of 3.2 A. a. What is the field at the centre of the coil ? b. What is the magnetic moment of this coil ? The coil is placed in a vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A unifrom magnetic field of 2 T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coil rotates through an angle of 90^@ under the influence of the magnetic field . c. What are the magnitudes of the torques on the coil in the initial and final position ? d. What is the angular speed acqired by the coil when it has rotated by 90^(@) ? The moment of inertia of the coil is 0.1 kg m^2