An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is____________?

Related Mcqs:

1. A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?

   A. 0.01 s
   B. 0.1 s
   C. 0.5 s
   D. 5 s

2. The out put voltage of a transformer is 3 times the input voltage then turns ratio will be________________?

   A. 3-Jan
   B. 3
   C. 1
   D. 6

3. An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called_____________?

   A. Induced current
   B. Eddy current
   C. Back emf
   D. None of the above

4. A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________?

   A. 6 mH
   B. 14 mH
   C. 24 mH
   D. 48 mH

5. If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?

   A. Vs/Vp = Np/Ns
   B. Vs/Vp = Ns/Np
   C. Vp/Vs = Ns/Np
   D. Vp/Vs = Np/Ns

6. 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

7. A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?

   A. 10 V
   B. 15 V
   C. 25V
   D. 50V

8. 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

9. 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

10. The self-inductance of a solenoid is increased when a soft iron core is inserted into it. This is because the soft iron core_______________?

    A. Decreases the resistance of the solenoid
    B. Reduces the effect of eddy current
    C. Improves the flux linkage between the turns of the coil
    D. Increases the mutual inductance between the solenoid and the core