ELECTROMAGNETIC FIELD THEORY QUIZ

Which of following is not a unit of flux?

Maxwell.

Telsa.

All of above.

Weber.

TRUE ANSWER : ?
YOUR ANSWER : ?

In order to minimize loss due to hysteresis the magnetic material should have

large coercivity.

high hysteresis coefficient.

small B-H loop area.

high resistivity.

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

Front to back ratio

Transmission efficiency

None of these

Loss coefficient

TRUE ANSWER : ?
YOUR ANSWER : ?

The potential that appears at a point in space due to the current which caused it is called potential

Retardation

Oscillating

Accelerating

Lagging the current

TRUE ANSWER : ?
YOUR ANSWER : ?

Unit of electric flux density is

farad / meter.

weber / meter2.

coulomb / meter2.

coulomb.

TRUE ANSWER : ?
YOUR ANSWER : ?

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

| E |.

E.

Null vector.

Zero.

TRUE ANSWER : ?
YOUR ANSWER : ?

The critical frequency of ‘F’ layer is greater than 30 MHz.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

Find the strength of the magnetic field when a 2m long conductor is moving with a velocity 4m/s inducing an emf of 20V.

5T.

10T.

2.5T.

0.5T.

TRUE ANSWER : ?
YOUR ANSWER : ?

If in a 1 mF capacitor, an instantaneous displacement current of 1 A is to be established in the spaces between its plates then it is possible by applying

106 Amp/sec.

106 Amp.

106 volts.

106 volts/sec.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is zero in relation to electromagnetic fields?

Grad div A.

Div grad V.

Div curl A.

Curl curl A.

TRUE ANSWER : ?
YOUR ANSWER : ?

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