ELECTROMAGNETIC FIELD THEORY QUIZ

In frec space E (z,t) = 103 sin(ωt - βz) uy v/m. What is the value of H (z,t)

(103/377) sin(ωt - β z)(-uy) A/m.

(103/377) cos(ωt - β z)(-ux) A/m.

None of above.

(103/377) sin(ωt - β z)(-ux) A/m.

TRUE ANSWER : ?
YOUR ANSWER : ?

A potential field is given by V = 3x2 y – yz. The electric field at P(2, -1, 4) is

12 Ix + 8 Iy + Iz V/m.

12 Ix - 8 Iy - Iz V/m.

12 Ix - 8 Iy V/m.

12 Ix - Iz V/m.

TRUE ANSWER : ?
YOUR ANSWER : ?

Unit of electric flux density is

coulomb / meter2.

coulomb.

farad / meter.

weber / meter2.

TRUE ANSWER : ?
YOUR ANSWER : ?

The radiation pattern of loop antenna is

Circle

Semicircle

Cardoid or Limacon

Elliptical

TRUE ANSWER : ?
YOUR ANSWER : ?

Magnetic circuit with cross sectional area of 20 cm2 is to be operated at 50 Hz from 120 Vrms supply. The number of turns required to active a peak magnetic flux density of 1.8 T in the core flux is

300.

600.

150.

450.

TRUE ANSWER : ?
YOUR ANSWER : ?

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

1.5 mA.

2.5 mA.

1mA.

2 mA.

TRUE ANSWER : ?
YOUR ANSWER : ?

The main purpose of choke is

to pass high frequencies.

to block low frequencies.

none of above.

to pass low frequencies.

TRUE ANSWER : ?
YOUR ANSWER : ?

An electric field on a place described by its potential V = 20 (r -1 + r-2) where r is the distance from the source. The field is due to

Both of A and B.

A dipole.

A monopole.

A quardra pole.

TRUE ANSWER : ?
YOUR ANSWER : ?

Cork Screw rule is used to find

direction of electric field.

direction of current.

direction of magnetic field.

direction of emf.

TRUE ANSWER : ?
YOUR ANSWER : ?

The power gain of a half-wave dipole with respect to an isotropic radiator is

4.15 db

2.15 db

3 db

6 db

TRUE ANSWER : ?
YOUR ANSWER : ?

↑