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Electromagnetic Field Theory

Electromagnetic Field Theory
Which of the following is multiband HF receiving antenna?

Square loop
Conical horn
Log-periodic
Folded dipole

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Electromagnetic Field Theory
An insulated metal sphere of 20 cm diameter is charged by rubbing with charges 2 × 10-8 C. Potential developed will be

 900 V.
 0 V.
 200 V.
 1800 V.

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Electromagnetic Field Theory
Skin depth is proportional to

 Frequency.
 √(σ).
 Permeability.
 1/√σ.

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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

 0.015 J.
 0.5 J.
 1.15 J.
 0.15 J.

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Electromagnetic Field Theory
The force on a charge moving with velocity v under the influence of electric and magnetic fields is given by which one of the following

 q(E + V × B).
 q(E + B × V).
 q(E +V × H).
 q(H + V × E).

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Electromagnetic Field Theory
A fan blade of length 2R rotates in a time period T in a magnetic field B. The induced voltage in the blade is proportional to

 R2B / T.
 R2BT.
 RBT.
 2RBT.

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MORE MCQ ON Electromagnetic Field Theory

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