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qUESTIONS

MCQs-PYQs-12th-jee

A metal conductor of length 1m rotates vertically about one of its ends at angular velocity 5 radians per second. If the horizontal component of earth’s magnetic field is 0.2x 104 T, then the e.m.f. developed between the two ends of the conductor is

MCQs-PYQs-12th-jee

A conducting rod AC of length 4l is rotated about a point O in a uniform magnetic field B directed into the paper. AO = l and OC = 3l. Then

MCQs-PYQs-12th-jee

Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross-sectional area A = 10 cm2 and length= 20 cm. If one of the solenoids has 300 turns and the other 400 turns, their mutual inductance is

MCQs-PYQs-12th-jee

An ideal coil of 10 henry is joined in series with a resistance of 5 ohm and a battery of 5 volt. 2 second after joining, the current flowing in ampere in the circuit will be

MCQs-PYQs-12th-jee

A coil of inductance 300 mH and resistance 20 is connected to a source of voltage 2V. The current reaches half of its steady state value in

MCQs-PYQs-12th-jee

In the circuit shown below, the key K is closed at t = 0. The current through the battery is

MCQs-PYQs-12th-jee

Two conducting circular loops of radii Ri and Re are placed in the same plane with their centres coinciding, If R1>> R2, the mutual inductance M between them will be directly proportional to

MCQs-PYQs-12th-jee

A current of 2.5 A flows through a coil of inductance 5H. The magnetic flux linked with the coil is

MCQs-PYQs-12th-jee

A long solenoid has 500 turns. When a current of 2 ampere is passed through it, the resulting magnetic flux linked with each tur of the solenoid is 4×10^2Wb. The self-inductance of the solenoid is

MCQs-PYQs-12th-jee

Two coils of self inductances 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is

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