
Electromagnetic Induction Quiz-2
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Popular Questions In Electromagnetic Induction Quiz-2
A (solenoid) coil is wound on a core of square cross-section. If all the linear dimensions of core are increased 2 times, but the number of turns per unit length of the coil, remains same, the self-inductance would increases by a factor of
Magnetic flux, through a stationary loop, with a resistance R, varies during the time internal as where a is a constant. The amount of of heat generated in the loop, during time internal, , would be
A conducting circular loop is placed in a uniform magnetic filed (of induction ‘B’tesla), with its plane normal to the field. If the radius of the loop were to start shrinking at a constant rate . The induced emf, at the instant when its radius is ‘r’, would be
A conducting rod of length L lies along the y–axis with one end at origin and the other end at (0, L, 0). There is a magnetic field in that region. If the rod moves with a velocity the e.m.f induced between the ends of the rod will be
The coefficient of mutual inductance of two circuits A and B is 3 mH and their respective resistances are 10 and 4 ohm. How much should the currents change, in 0.02 second, in circuit A, so that an induced current 0.006 ampere flows through the circuit B?
A series LCR circuit can bring about a ‘voltage magnification’, of the voltage of the a.c. source connected across it, provided the frequency, of the a.c. voltage source equals
A step-down transformer (having windings of negligible resistance) is used to step down the mains voltage of 220V, to22V to operate a device of impedance . Assuming an efficiency of 80%, the current flowing in the primary coil of two transformer is
For a pure inductor, or a pure capacitor, connected to an a.c. voltage source, one can say that the instantaneous power.
The inductance, capacitance and resistance in a given series LCR circuit, have values of (n) henry, farad, and ohm. The quality factor, Q, and the resonant frequency , of this circuit, equal, respectively,
It is required to improve the sharpness of resonance of a series LCR circuit by a factor of 4. This requirement can be met by