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qUESTIONS

MCQs-PYQs-12th-jee

Two identical induction coils each of inductance L joined in series are placed very close to each other such that the winding direction of one is exactly opposite to that of the other. What is the net inductance

MCQs-PYQs-12th-jee

When the current through a solenoid increases at a constant rate, the induced current

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

MCQs-PYQs-12th-jee

A square current-carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is F, the net force on the remaining three arms of the loop is

MCQs-PYQs-12th-jee

A current carrying closed loop in the form of a right angle isosceles triangle ABC is placed in a uniform magnetic field acting along AB. If the magnetic force on the arm BC is vector F the force on the arm AC is

MCQs-PYQs-12th-jee

A closely wound solenoid of 2000 turns and area of cross-section 1.5×10^–4 m^2 carries a current of 2.0 A. It is suspended through its centre and perpendicular to its length, allowing it to turn in a horizontal plane in a uniform magnetic field 5×10^–2 tesla making an angle of 30 with the axis of the solenoid. The torque on the solenoid will be

MCQs-PYQs-12th-jee

A rectangular coil of length 0.12m and width 0.1m having 50 turns of wire is suspended vertically in a uniform magnetic field of strength 0.2 Weber/m^2. The coil carries a current of 2A. If the plane of the coil is inclined at an angle of 30 with the direction of the field, the torque required to keep the coil in stable equilibrium will be

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