emf induced in a circuit according to Faradays law depends on the_____________?

Related Mcqs:

1. The emf induced in a coil by a changing magnetic flux may have unit as______________?

   A. ms-1A
   B. ms-2A-1
   C. kgms2A-1
   D. kgm2s-1A-1

2. The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to_____________?

   A. Magnetic flux density
   B. Torque
   C. Mutual induction
   D. Motional emf

3. A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time Δt then what is the emf induced in the coil ?

   A. ωB/r22-r12/Δt
   B. ωB(r2-r1)2/Δt
   C. ωB(r22-r12)/Δt
   D. ωB(r22+r12)/Δt

4. An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?

   A. 150msec-1
   B. 384msec-1
   C. 38.4msec-1
   D. 200msec-1

5. For proper amplification by a transistor circuit, the operating point should be located at the_____________ of the d.c. load line?

   A. The end point
   B. Middle
   C. The maximum current point
   D. None of the above

6. If current in a conductor increases then according to Lenz’s law self-induced voltage will____________?

   A. aid the increasing current
   B. tend to decrease the amount of cur-rent
   C. produce current opposite to the in-creasing current
   D. aid the applied voltage

7. The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns

   A. Yes
   B. No

8. The magnitude of the induced e.m.f. in a conductor depends on the______________?

   A. flux density of the magnetic field
   B. amount of flux cut
   C. amount of flux linkages
   D. rate of change of flux-linkages

9. When the motor is at its maximum speed then back emf will be______________?

   A. Maximum
   B. Zero
   C. Intermediate values
   D. No back emf

10. A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is_____________?

    A. 0 volt
    B. 3.125 volt
    C. 31.25 volt
    D. 0.03125 volt