Electromagnetic Theory [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 80 - 84 of 88

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Question 80

Electromagnetic Theory

Appeared in Year: 2006

Question

MCQ▾

Which one of the following sets of Maxwell՚s equations for time – independent charge density and current density is correct?

Choices

Choice (4)Response

a.

b.

c.

d.

Question 81

Appeared in Year: 2006

Question

MCQ▾

At the interface between two linear dielectrics (with dielectric constants and ) , the electric field lines bend, as shown in the figure. Assume that there are no free charges at the interface. The ration is –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 82

Appeared in Year: 2006

Question

MCQ▾

Three point charges and are located at and , respectively. The net dipole moment of this charge distribution is –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 83

Appeared in Year: 2017

Question

MCQ▾

Identical charges are placed at five vertices of a regular hexagon of side . The magnitude of the electric field and the electrostatic potential at the centre of the hexagon are respectively,

Choices

Choice (4)Response

a.

b.

c.

d.

Question 84

Appeared in Year: 2017

Describe in Detail

Essay▾

A monochromatic plane wave in free space with electric field amplitude of is normally incident on a fully reflecting mirror. The pressure exerted on the mirror is . (up to two decimal places) .

Explanation

The radiation pressure exerted on the mirror, due to a monochromatic plane wave in free space with electric field amplitude of is normally incident on a fully reflecting mirror, is given as;

Here, electric field is normally incident, that means angle between electric field and normal of the mirror is zero .

Since,

Therefore, from equation (1) ,

Developed by: