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Electromagnetic Field Theory

Electromagnetic Field Theory
Which of the following represents ohms law

 V = RI
All of these
 I = GV
 J = σE

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Electromagnetic Field Theory
A conductor of length 1 metre moves at right angles to magnetic field of flux density 1 Wb/m2 with a velocity of 25 m/s. The induced emf in the conductor will be

 50 V.
 75 V.
 100 V.
 25 V.

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Electromagnetic Field Theory
The Biot-savarts law is a general modification of

 Amperes law.
 Lenzs law.
 Kirchhoffs law.
 Faradays law.

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Electromagnetic Field Theory
The two windings of a transformer have an inductor of 2 H each. If mutual inductor between them is also 2 H, then

 it is a perfect transformer.
 transformer is an ideal transformer.
 none of these.
 turns ratio of the transformer is also two.

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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
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

 R2B / T.
 RBT.
 2RBT.
 R2BT.

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MORE MCQ ON Electromagnetic Field Theory

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