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Electromagnetic Field Theory

Electromagnetic Field Theory
The main purpose of choke is

 to block low frequencies.
  to pass low frequencies.
 to pass high frequencies.
 none of above.

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Electromagnetic Field Theory
A magnetic circuit requires 800 AT to produce a certain quantity of flux in a magnetic circuit. If its excitation coil has 100 turns and 5 Ohm resistance, the voltage to be applied in exciting coil is

 8 V.
 60 V.
 40 V.
 80 V.

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Electromagnetic Field Theory
A negative point charge q = - 40 nC is moving with velocity of 6 × 106 m/s in a direction specited by unit vector uy + 0.6 uz. Find the magnitude of force vector on the moving particle by the field B = 2 ux + 3 uy + 5 uz mT and E = 2 ux - 3 uy + 5 uz KV/m

 1440 μN.
 144 μN.
 244 μN.
  1144 μN.

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Electromagnetic Field Theory
Cork Screw rule is used to find

 direction of current.
 direction of magnetic field.
 direction of electric field.
 direction of emf.

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

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

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Electromagnetic Field Theory
The radiation pattern of Hertzian dipole in the plane perpendicular to dipole is a

Circle
Figure of eight
None of these
Null

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