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Electromagnetic Field Theory

Electromagnetic Field Theory
The magnetic field required to reduce the residual magnetism to zero is called

 Coercivity.
 Retentivity.
 Hysteresis.
 Saturation magnetism.

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Electromagnetic Field Theory
A plane wave magnetic field is represented by Bx = cos(y – ct). The electric and magnetic fields will be zero in the direction

 Ex = Ey = 0, Bx = By = 0.
 Ex = Ey = 0, By = Bz = 0.
 None of these.
 Ey = Ez = 0, By = Bz = 0.

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Electromagnetic Field Theory
In a lossless medium the intrinsic impedance η = 60π and μr = 1. The relative dielectric constant εr shall be

 4.
 8.
 2.
 1.

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Electromagnetic Field Theory
In above question no. 9, the average force on the core to reduce the air gap will be

 1666.22 N.
 3332.47 N.
 832.29 N.
 6664.8 N.

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Electromagnetic Field Theory
The force on a charge moving with velocity v under the influence of electric and magnetic fields is given by which one of the following

 q(E + B × V).
 q(E + V × B).
 q(H + V × E).
 q(E +V × H).

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Electromagnetic Field Theory
The force required to seperate two surfaces with a contact area measuring 5 cm by 6 cm, when flux density normal to the surface is 0.8 tesla, will be

 7640 N.
 764 N.
 76400 N.
 76.4 N.

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