ELECTROMAGNETIC FIELD THEORY QUIZ

Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?

None of these

Dust particles may not accumulate

Charge per unit area becomes very high for lightening to discharge

Rain drops may not collect

TRUE ANSWER : ?
YOUR ANSWER : ?

Poyniting vector has the dimensions

Watts/metre2.

Watt × metre2.

Watt × metre.

Watt/metre.

TRUE ANSWER : ?
YOUR ANSWER : ?

The minimum height of outer atmosphere is

100 km

400 km

200 km

150 km

TRUE ANSWER : ?
YOUR ANSWER : ?

Magnetostriction is a phenomenon of

generation of magnetism in electrical conductors.

change in permeability of ferromagnetic materials during magnetism.

generation of electricity in ferromagnetic materials.

change in physical dimensions of ferromagnetic materials during magnetism.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of following is not a unit of flux?

Weber.

All of above.

Telsa.

Maxwell.

TRUE ANSWER : ?
YOUR ANSWER : ?

The magnitude of the induced emf in a conductor depends upon on the

amount of flux cut.

flux density of the magnetic field.

rate of change of flux linkage.

amount of flux linkage.

TRUE ANSWER : ?
YOUR ANSWER : ?

How much current must flow in a loop of radius 1m to produce a magnetic field of 1 mA/m?

1mA.

2 mA.

2.5 mA.

1.5 mA.

TRUE ANSWER : ?
YOUR ANSWER : ?

A conductor is rotating with in a magnetic field. At which of the positions do the peak voltages occur?

Anywhere.

At right angles to the axis of the magnetic field.

Along the axis of the magnetic field.

At an angle of 45° to the axis of the magnetic field.

TRUE ANSWER : ?
YOUR ANSWER : ?

The force required to seperate two surfaces with a contact area measuring 5 cm by 6 cm, when flux density normal to the surface is 0.8 tesla, will be

7640 N.

76.4 N.

76400 N.

764 N.

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Unit vector

Vector

None of these

Scalar

TRUE ANSWER : ?
YOUR ANSWER : ?