ELECTROMAGNETIC FIELD THEORY QUIZ

An insulated metal sphere of 20 cm diameter is charged by rubbing with charges 2 × 10-8 C. Potential developed will be

900 V.

0 V.

1800 V.

200 V.

TRUE ANSWER : ?
YOUR ANSWER : ?

In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to

An increase in the value of reactance

Decrease in the value of reactance

No change in the impedance value

No change in the reactance value

TRUE ANSWER : ?
YOUR ANSWER : ?

Find H for centre of solenoid having finite length d = 1 unit where N = no of turns = 500, I = 2 A.

None of these.

100.

1000.

500.

TRUE ANSWER : ?
YOUR ANSWER : ?

The tubes of force within the magnetic material are known as

none of them.

magnetic flux.

tubes of indication.

lines of force.

TRUE ANSWER : ?
YOUR ANSWER : ?

MUF is depend upon

Height of ionospheric layer

Electron density of the ionospheric layer

Received frequency by receiver

11 year sun spot cycle

TRUE ANSWER : ?
YOUR ANSWER : ?

Fleming's right hand rule may be applied to an electric generator to find out the direction of

rotor rotation.

magnetic field.

None of these

induced emf.

TRUE ANSWER : ?
YOUR ANSWER : ?

The frequency range for satellite communication is

30000 to 300000 MHz

300 to 3000 kHz

3 to 30 kHz

3000 to 30000 MHz

TRUE ANSWER : ?
YOUR ANSWER : ?

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 is the complex conjugate of the other

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

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of this statement is not characteristic of a static magnetic field

magnetic flux lines are always closed.

it has no sink or sources.

it is solenoidal.

it is conservative.

TRUE ANSWER : ?
YOUR ANSWER : ?

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 both rotating and transformer action.

Zero.

Due to transformer only.

Due to rotating only.

TRUE ANSWER : ?
YOUR ANSWER : ?

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