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Electromagnetic Induction Quiz-2

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10 Questions

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 τ'\tau' as ϕ=at(τt)\phi=at(\tau-t) where a is a constant. The amount of of heat generated in the loop, during time internal, τ\tau , 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 drdt\frac{dr}{dt}. 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 B=B0yk^B=B_0y\hat k in that region. If the rod moves with a velocity V=V0i^,V=V_0\hat i, 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 10Ω\Omega 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 220Ω220\,\Omega. 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, (1n3)\left(\frac {1}{n^3}\right) farad, and (n2)(n^2)ohm. The quality factor, Q, and the resonant frequency (V0)(V_0), 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