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Electromagnetic Field Theory

Electromagnetic Field Theory
An emf of 16 volts is induced in a coil of inductance 4 H. The rate of change of current must be

 32 A / s.
 4 A / s.
 64 A / s.
 16 A / s.

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Electromagnetic Field Theory
A vector field A = p In is given in Cartesian coordinates. In cylindrical coordinates it will be represented as

 A = sinφ Ir.
 A = cosφ Ir - sinφ Ir.
 A = cosφ Ir.
 A = cosφ Ir + sinφ Iφ.

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Electromagnetic Field Theory
The heating time constant of an electrical machine gives an indication of its

 rating.
 overload capacity.
 cooling.
 short time rating.

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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.

 1000.
 100.
 500.
 None of these.

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Electromagnetic Field Theory
In free space E (z, t) = 103 sin(ωt - βz) uy v/m. What is the value of H (z, t)

 (103/377) cos(ωt - β z)(-ux) A/m.
 (103/377) sin(ωt - β z)(ux) A/m.
 (103/377) sin(ωt - β z)(-ux) A/m.
 None of above.

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Electromagnetic Field Theory
The magnitude of the induced emf in a conductor depends upon on the

 flux density of the magnetic field.
 amount of flux cut.
 amount of flux linkage.
 rate of change of flux linkage.

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MORE MCQ ON Electromagnetic Field Theory

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