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Electromagnetic Field Theory

Electromagnetic Field Theory
For an inductor, current is proportional to

 magnetic field.
 voltage across the inductor.
 both (A) and (B).
 none of them.

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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

 4t3.
 12t.
 12t3.
 24t.

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Electromagnetic Field Theory
RF inductor are characterized by

 low current rating and high resistance.
 high current rating and high resistance.
 low current rating and low resistance.
 high current rating and low resistance.

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Electromagnetic Field Theory
The core of coil length is 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

 24 mH.
 3 mH.
 48 mH.
 12 mH.

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Electromagnetic Field Theory
A metal sphere with 1 m radius and a surface charge density of 10 coulombs/m2 is enclosed in a cube of 10 m side. The total outward electric displacement normal to the surface of the cube is

 40π C.
 None of above.
 5 C.
 10 C.

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Electromagnetic Field Theory
A pure inductor when connected across 220 V, 50 Hz supply consumes 100 W. From the above statement it can be concluded that

 the inductor is made of thin wire.
 the above statement is false.
 the inductor has ferrite core.
 the inductor is non linear.

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