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Electromagnetic Field Theory

Electromagnetic Field Theory
A magnetic vector potential is given by the expression A = (- cos x) (cos y) uz. The flux density at the origin is

 – 2 ux.
 – uy.
  0.
 2 ux.

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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
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

 3 mH.
 48 mH.
 24 mH.
 12 mH.

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Electromagnetic Field Theory
The electric flux is given D = (2y2 + z) Ix + 4xy Iy + x Iz C/m2. The volume charge density at point (-1, 0, 3) is

 - 2 C/m3.
 0 C/m3.
 - 8 C/m3.
 - 4 C/m3.

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Electromagnetic Field Theory
What is the unit of magnetic charge

  Ampere meter.
 Ampere.
 Coulomb.
 Ampere-meter square.

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Electromagnetic Field Theory
A charge which when placed in vacuum from an equal and similar charge repels with a force of 9 × 103 N, is known as

 coulomb.
 micro - coulomb.
 pico - coulomb.
 milli - coulomb.

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