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Electromagnetic Field Theory

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
A point pole has a strength of 4π × 10-4 weber. The force in newtons on a point pole of 4π × 1.5 × 10-4 weber placed at a distance of 10 cm from it will be

 7.5 N.
 20 N.
 15 N.
 3.75 N.

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Electromagnetic Field Theory
An inductor designed with 400 turns coil wound on an iron core of 16 cm2 cross sectional area and with a cut of air gap length of 1 mm. The coil is connected to a 230 V, 50 Hz supply. Neglected coil resistance, core loss, iron reluctance and leakage inductance. Find the current in the inductor.

 4.56 A.
 9.04 A.
 2.28 A.
 18.08 A.

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Electromagnetic Field Theory
MUF is highest in periods of greatest sunspot activity.

False
True

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Electromagnetic Field Theory
When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

None of these
The value of current
The direction of the conductor
The weight of the conductor

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Electromagnetic Field Theory
The divergence of a vector is a scalar, while the curl of a vector is another

None of these
Scalar
Vector
Unit vector

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