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qUESTIONS

MCQs-PYQs-12th-jee

Two similar coils of radius R are lying concentrically with their planes at right angles to each other. the currents flowing in them are l and 2l, respectively. The resultant magnetic field in induction at the centre will be

MCQs-PYQs-12th-jee

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60° is W. Now the torque required to keep the magnet in this new position is

MCQs-PYQs-12th-jee

An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current i along the same direction is shown in fig. Magnitude of force per unit length on the middle wire ‘B’ is given by

MCQs-PYQs-12th-jee

A metallic rod of mass per unit length 0.5 kg m-1 is lying horizontally on a smooth inclined plane which makes an angle of 30° with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is

MCQs-PYQs-12th-jee

A current loop in a magnetic field

MCQs-PYQs-12th-jee

A cylindrical conductor of radius R is carrying a constant current i. The plot of the magnitude of the magnetic field B with distance d from the centre of the conductor is correctly represented by the figure

MCQs-PYQs-12th-jee

An electron is moving in a circular path under the influence of a transverse magnetic field of 3.57 x 10^-2 T. If the value of e/m is 1.76 x 10^11 C kg-1, the frequency of revolution of the electron is

MCQs-PYQs-12th-jee

Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is?

MCQs-PYQs-12th-jee

A square loop ABCD, carrying a current i, is placed near and coplanar with a long straight conductor XY carrying a current I, the net force on the loop will be

MCQs-PYQs-12th-jee

A closed loop PQRS carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments PS, SR and RS are F1, F2 and F3 respectively and are in the plane of the paper and along the directions shown, the force on the segment QP is

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