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Electromagnetic Field Theory

Electromagnetic Field Theory
Which of the following represents ohms law

 I = GV
 V = RI
 J = σE
All of these

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Electromagnetic Field Theory
A solid sphere made of insulating material has a radius R and has a total charge Q distributed uniformly in its volume. What is the magnitude of electric field intensity, E, at a distance r (o less than r less than R) inside the sphere

 Q/(4 π εo r3).
 QR/(4π εo r3).
 Qr/(4 π εo R3).
 3 Qr/(4 π εo R3).

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Electromagnetic Field Theory
The static electric field in a conductor is

None of these
Unity
Infinity
Zero

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Electromagnetic Field Theory
The divergence of a vector is a scalar, while the curl of a vector is another

Unit vector
Scalar
None of these
Vector

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

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

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

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

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