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The coefficient of mutual inductance of two circuits A and B is 3 mH and their respective resistances are 10 ohm and 4 ohm. How much current should change in 0.02 second in the circuit A. So that the induced current in
B should be 0.006 ampere-CorrectIncorrect
The coefficient of self inductance is 5 mH. If the emf of the cell in the circuit is 1.1 volt and at any instant the rate of increase of current is 6 ampere/second, then at that instant, the resultant e.m.f. in the circuit will be-CorrectIncorrect
An inductor coil stores 32 J of magnetic field energy and dissipates energy as heat at the rate of 320 W, when a current of 4 A is passed through it. The time constant of the circuit when this coil is joined across an ideal battery will be-CorrectIncorrect
A solenoid of inductance 50 mH and resistance 10 ohm is connected to a battery of 6V. The time elapsed before the current acquires half of its steady-state value will be-CorrectIncorrect
Two conducting circular loops of radii R1 and R2 are placed in the same plane with their centres coinciding. The mutual inductance between them assuming R2 < < R1 , will be-CorrectIncorrect
A closed coil of copper whose area is 1m × 1m is free to rotate about an axis. The coil is placed perpendicular to a magnetic field of 0.10 Wb/m2. It is rotated through 180º in 0.01 second. The induced e.m.f. and induced current in the coil will respectively be-
(The resistance of the coil is 2.0 W)CorrectIncorrect
A bicycle wheel of radius 0.5 m has 32 spokes. It is rotating at the rate of 120 revolutions per minute, perpendicular to the horizontal component of earth’s magnetic field BH = 4 × 10–5 Tesla. The emf induced between the rim and the centre of the wheel will be-CorrectIncorrect
The current in a coil varies with respect to time t as I = 3t2 + 2t. If the inductance of coil be 10 mH, the value of induced e.m.f. at t = 2s will be-CorrectIncorrect
A closed coil consists of 500 turns on a rectangular frame of area 4.0 cm2 and has a resistance of 50 ohm. The coil is kept with its plane perpendicular to a uniform magnetic field of 0.2 Weber/meter2. The amount of charge flowing through the coil if it is turned over (rotated through 180º) will be –CorrectIncorrect
A solenoid has an inductance of 50 mH and a resistance of 0.025 W. If it is connected to a battery, how long will it take for the current to reach one half of its final equilibrium value?CorrectIncorrect