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Electromagnetic Field Theory

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

 R2BT.
 RBT.
 2RBT.
 R2B / T.

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Electromagnetic Field Theory
The force required to seperate two surfaces with a contact area measuring 5 cm by 6 cm, when flux density normal to the surface is 0.8 tesla, will be

 76.4 N.
 7640 N.
 764 N.
 76400 N.

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Electromagnetic Field Theory
Two parallel plates are separated by a distance D charged by V volt. The field intensity E is given by,

 V × D
 V² / D
 V / D
 V × D²

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Electromagnetic Field Theory
Electric flux in coulombs emanating from any surface of a cube containing C coulombs of charge at its centre is

 Q / 4π.
 Q / 6ε.
 4πQ / 6ε.
 Q / 6.

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Electromagnetic Field Theory
The transmitting antennas for lower frequencies (below 500 kHz) are generally

Any of the above
Vertical grounded wire type
Horizontal suspended wire type
Parabolic reflector type

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Electromagnetic Field Theory
A solid sphere made of insulating material has a radius R and has a total charge Q distributed uniformly in its volume. What is the magnitude of electric field intensity, E, at a distance r (o less than r less than R) inside the sphere

 Q/(4 π εo r3).
 QR/(4π εo r3).
 3 Qr/(4 π εo R3).
 Qr/(4 π εo R3).

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MORE MCQ ON Electromagnetic Field Theory

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