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Electromagnetic Field Theory

Electromagnetic Field Theory
A wire 1 m long carries a current of 5A and is at an angle of 30o with B = 1.5 wb/m2. Magnitude of force is

 2.5 N.
 3.75 N.
 2 N.
 5 N.

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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
If the resistance of a conductor does not vary in accordance with the Ohms law it is known as

 bad conductor.
 non - linear conductor.
 non - conductor.
 reverse conductor.

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Electromagnetic Field Theory
The main disadvantage of the two-hole directional coupler is

Low directional coupling
Narrow bandwidth
Poor directivity
High standing wave ratio

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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

 24t.
 12t.
 12t3.
 4t3.

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Electromagnetic Field Theory
The energy stored in the magnetic field in a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying a current at 10 amp, is

 0.015 joule.
 0.015 joule.
 1.15 joule.
 0.15 joule.

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