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Electromagnetic Field Theory

Electromagnetic Field Theory
When a conductor moves in the field, so that it makes an angle 8 with the lines of flux, the force F is given as : F = Bl sin2 0.

Yes
No

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Electromagnetic Field Theory
Which of the following is zero in relation to electromagnetic fields?

 Curl curl A.
 Div grad V.
 Grad div A.
 Div curl A.

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Electromagnetic Field Theory
Ohm’s law in point from field theory can be expressed as

 R = ρ × ( l / A).
 V = IR.
 J = σE.
 J = E / σ.

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Electromagnetic Field Theory
A sphere of 20 cm radius contains electrical charge of density 2/(r sinθ) c/m3. What is the total charge contained within the sphere?

 0.335/sinθ c.
 0.335 C.
 None of above.
 0.

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Electromagnetic Field Theory
The transmitting antennas for lower frequencies (below 500 kHz) are generally

Any of the above
Vertical grounded wire type
Parabolic reflector type
Horizontal suspended wire type

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Electromagnetic Field Theory
Midway between two equal and similar charges, a third equal and similar charge is placed, then this third charge will

 not be equilibrium.
 will move out of the field of influence of two charges.
 be in unstable equilibrium.
 remain in stable equilibrium.

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