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Electromagnetic Field Theory

Electromagnetic Field Theory
Two straight parallel conductors carry equal currents in opposite direction. The force between them is

 none of above.
 attractive.
 zero.
 repulsive.

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Electromagnetic Field Theory
The drawback of Daltons atomic structure is that, it says

 most of the volume of an atom is empty space.
 unique nature of atom.
 the atoms can neither be created nor be destroyed.
 none of these.

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Electromagnetic Field Theory
Ohm’s law in point from field theory can be expressed as

 V = IR.
 J = σE.
 J = E / σ.
 R = ρ × ( l / A).

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Electromagnetic Field Theory
The Kirchhoff’s current law is implict in expression

 Divergence of B = 0.
 Curl of H = J + (δ D)/(δ t).
 Divergence of D = ρv.
  Surface integral of (j.ds) = 0.

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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

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

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Electromagnetic Field Theory
A loop is rotating about x-axis in a magnetic field, B = BO cos(ω + φ) ay. The voltage in the loop is

 Due to rotating only.
 Zero.
 Due to transformer only.
 Due to both rotating and transformer action.

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