ELECTROMAGNETIC FIELD THEORY QUIZ

If E is the electric field intensity, then what is the value of divergence of (curl of E)?

Zero.

E.

| E |.

Null vector.

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A wire carrying current is bent in the form of a circular loop. Then the magnetic field around each portion of the wire will be

perpendicular to the circumference of the wire.

parallel to the plane of the wire.

none of above.

parallel to half portion and perpendicular for the other half.

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Magnetic current is composed of which of the following?

Only displacement current.

None of these

Only conduction current.

Both conduction and displacement current.

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The electrical field strength at a distance point A due to a point charge +q, located at the origin, is 100 µl v/m. If the point charge is now enclosed by a perfectly conducting metal sheet sphere whose centre is at origin, A, outside the sphere, becomes

None of above.

0.

100 μ v/m.

- 100 μ v/m.

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The force experienced by a current carrying conductor lying parallel to a magnetic field is

BIL.

zero.

Bil sinθ.

Bil cosθ.

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According to maximum power transfer theorem, the maximum power is absorbed by one network from another network when

The impedance of one is equal to that of the other

The impedance of one of the networks is half that of the other

The impedance of one is the complex conjugate of the other

None of these

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According to Coulomb’s law, the force of attraction or repulsion, between to electrical charges is

directly proportional to the distance between them.

directly proportional to the square of the distance between them.

inversely proportional to the distance between them.

inversely proportional to the square of the distance between them.

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The magnetic field at any point on the axis of current carrying circular coil will be

parallel to axis.

zero.

perpendicular to axis.

at an angle 45o with the axis.

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The coils having self inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect then in series opposing?

0 mH.

5 mH.

10 mH.

20 mH.

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The property of the coil by which a counter emf is induced in it when the current through the coil changes is known as

capacitance.

series aiding inductance.

mutual inductance.

self inductance.

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