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Electromagnetic Field Theory

Electromagnetic Field Theory
Which of following can induce the maximum induced voltage ?

 1 amp dc.
 1 amp 100 Hz.
 1 amp 1 Hz.
 20 amp dc.

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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
An electric field of 1.92 × 103 N/C is maintained across two plates separated by 0.015 m. Potential difference across plates will be

 1.4 V.
 2.88 V.
 28.8 V.
 14.40 V.

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Electromagnetic Field Theory
The core of coil length is 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

 12 mH.
 3 mH.
 48 mH.
 24 mH.

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Electromagnetic Field Theory
________ at a point is defined as the force experienced per unit positive charge at a point placed in the electric field.

 Electric intensity.
 Electric flux.
None of these
 Magnetic flux density.

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Electromagnetic Field Theory
A voltage waveform V(t) = 12t2 is applied across a 1H inductor for t = 0, with initial current through it being zero. The current through the inductor for t = 0 is given by

 4t3.
 12t3.
 24t.
 12t.

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