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Electromagnetic Field Theory

Electromagnetic Field Theory
The frequency range for satellite communication is

3 to 30 kHz
300 to 3000 kHz
30000 to 300000 MHz
3000 to 30000 MHz

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Electromagnetic Field Theory
A magnetic field B = 5 × 10-2 uz T exerts a force on 0.02 m conductor along the x-axis. The conductor carried a current of 5 mA in the – ux direction. What force must be applied to the conductor to hold it in position

 5 × 10-5 uy N.
  - 5 × 10-5 uy N.
 5 × 10-5 ux N.
 5 × 10-5 uz N.

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

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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.
 R2B / T.
 RBT.
 R2BT.

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Electromagnetic Field Theory
A plane wave magnetic field is represented by Bx = cos(y – ct). The electric and magnetic fields will be zero in the direction

 Ex = Ey = 0, Bx = By = 0.
 Ey = Ez = 0, By = Bz = 0.
 Ex = Ey = 0, By = Bz = 0.
 None of these.

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Electromagnetic Field Theory
Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?

Dust particles may not accumulate
Charge per unit area becomes very high for lightening to discharge
Rain drops may not collect
None of these

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