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Electromagnetic Field Theory

Electromagnetic Field Theory
Electric field inside a hollow metallic charged sphere is

 none of above.
 increasing towards centre.
 decreasing towards centre.
 zero.

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Electromagnetic Field Theory
In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

None of these
Loss coefficient
Front to back ratio
Transmission efficiency

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Electromagnetic Field Theory
Two coils have inductances L1 = 1200 mH and L2 = 800 mH. They are connected in such a way that flux in the two coils aid each other and inductance is measured to be 2500 mH, then Mutual inductance between the coils is ___________ mH.

 150.
 250.
 225.
 145.

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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

 2RBT.
 R2BT.
 RBT.
 R2B / T.

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Electromagnetic Field Theory
The operation of electric generators and motors depend on the intraction between magnetic field and

  Electric current.
 Electric fields.
 Commutator.
 Copper conductors.

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

Log-periodic
Folded dipole
Conical horn
Square loop

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MORE MCQ ON Electromagnetic Field Theory

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