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Electromagnetic Field Theory

Electromagnetic Field Theory
Which of following circuit element stores energy in electro-magnetic field?

 Variable Resistor.
 Condenser.
 Inductor.
 Capacitor.

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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.
 1.15 joule.
 0.015 joule.
 0.15 joule.

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Electromagnetic Field Theory
A potential field is given by V = 3x2 y – yz. The electric field at P(2, -1, 4) is

 12 Ix - 8 Iy - Iz V/m.
 12 Ix - Iz V/m.
 12 Ix - 8 Iy V/m.
 12 Ix + 8 Iy + Iz V/m.

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Electromagnetic Field Theory
The electrical field strength at a distance point A due to a point charge +q, located at the origin, is 100 µl v/m. If the point charge is now enclosed by a perfectly conducting metal sheet sphere whose centre is at origin, A, outside the sphere, becomes

 0.
 - 100 μ v/m.
 None of above.
 100 μ v/m.

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Electromagnetic Field Theory
Two coupled coils with L1 = L2 = 0.6 H have a coupling coefficient of K = 0.8. The turns ratio N1/N2 is

 1.
 2.
 0.5.
 4.

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Electromagnetic Field Theory
In frec 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)(-uy) A/m.
 None of above.
  (103/377) sin(ωt - β z)(-ux) A/m.

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