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Electromagnetic Field Theory

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

 0.5 J.
 1.15 J.
 0.15 J.
 0.015 J.

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Electromagnetic Field Theory
A conductor of length 1 metre moves at right angles to magnetic field of flux density 1 Wb/m2 with a velocity of 25 m/s. The induced emf in the conductor will be

 25 V.
 75 V.
 100 V.
 50 V.

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Electromagnetic Field Theory
The shape of B-H curve for air gap is

 ellipse.
 parabola.
 hyperbola.
 straight line.

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Electromagnetic Field Theory
A magnetic circuit requires 800 AT to produce a certain quantity of flux in a magnetic circuit. If its excitation coil has 100 turns and 5 Ohm resistance, the voltage to be applied in exciting coil is

 40 V.
 8 V.
 60 V.
 80 V.

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Electromagnetic Field Theory
________ at a point is defined as the force experienced per unit positive charge at a point placed in the electric field.

 Electric flux.
 Magnetic flux density.
None of these
 Electric intensity.

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Electromagnetic Field Theory
If a and b are the dimensions of waveguide then

a = 2b
a = 3b
a = b
a = b/4

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