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Electromagnetic Field Theory

Electromagnetic Field Theory
A voltage waveform V(t) = 12t2 is applied across a 1H inductor for t = 0, with initial current through it being zero. The current through the inductor for t = 0 is given by

 12t.
 4t3.
 24t.
 12t3.

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Electromagnetic Field Theory
Find H for centre of solenoid having finite length d = 1 unit where N = no of turns = 500, I = 2 A.

 100.
 None of these.
 1000.
 500.

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

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

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Electromagnetic Field Theory
Which of following is not a unit of flux?

 Maxwell.
 All of above.
 Weber.
 Telsa.

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Electromagnetic Field Theory
The emf induced in a conductor rotating in bipolar field is

 DC and AC both.
 DC.
 none of these.
 AC.

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Electromagnetic Field Theory
In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

None of these
Transmission efficiency
Loss coefficient
Front to back ratio

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