Magnetic flux has the unit of

Related Mcqs:

1. 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

2. 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

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. 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

5. Lagging of changes in the magnetization of a substance behind changes in the magnetic field as the magnetic field is varied is known as magnetic_____________?

   A. Retaintivity
   B. Permeability
   C. Flux
   D. Hysteresis

6. In series motor which of the following methods can be used for changing the flux per pole ?

   A. Tapped field control
   B. Diverter field control
   C. Series-parallel control
   D. Any of the above

7. If the coil is wound on an iron core the flux through it will_______________?

   A. decrease
   B. become zero
   C. remain the same
   D. increase

8. A closed surface contains two equal and opposite charges. The net electric flux from the surface will be________________?

   A. negative
   B. positive
   C. zero
   D. data is insufficient

9. Electric flux due to a point charge +q is______________?

   A. 1/4IIɛ q/r
   B. q/ɛ0
   C. 1/4IIɛ0. q/r2
   D. 4IIɛ0

10. Electric flux linked with a surface will be maximum when____________?

    A. The surface is held parallel to the electric field
    B. The surface is held perpendicular to the electric field
    C. The surface makes an angle of 45°with the field
    D. All of the above