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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A circular of radius 0.157 m has turns. It is placed such that its axis is in magnetic meridian. A dip needle is supported at the centre of the coil with its axis of rotation horizontal, and in the plane of the coil. The angle of dip is 30∘ when a current flows through the coil. The angle of dip becomes 60∘ on reversing the current. Find the current in the coil assuming that the magnetic field due to the coil is smaller than the horizontal component of earth’s magnetic field, H = 3×10^−5 T

A circular of radius 0.157 m has turns. It is placed such that its axis is in magnetic meridian. A dip needle is supported at the centre of the coil with its axis of rotation horizontal, and in the plane of the coil. The angle of dip is 30∘ when a current flows through the coil. The angle of dip becomes 60∘ on reversing the current. Find the current in the coil assuming that the magnetic field due to the coil is smaller than the horizontal component of earth’s magnetic field, H = 3×10^−5 T

A circular of radius 0.157 m has turns. It is placed such that its axis is in magnetic meridian. A dip needle is supported at the centre of the coil with its axis of rotation horizontal A closely wound solenoid of 1000 turns and area of cross-section 2.0×10^−4 m^2 A small magnet of magnetic moment M is placed at broad side on position of a magnet of magnetic M' as shown in Fig. (a) What is the torque experienced by the solenoid due to the field ? (b) If the solenoid is free to turn about the verticle direction carrying a current of 2.0 A. It is placed with its horizontal axis at 30∘ with the direction of a uniform horizontal magnetic field of 0.16 T specify its orientations of stabvle and unstable equilibriums. What is the amount of work needed to displace the solenoid from its stable orientation to its unstable orientations ?