Electromagnetic Theory (CSIR Physical Sciences): Questions 5 - 7 of 55

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Question number: 5

» Electromagnetic Theory » Electrostatics: Gauss's Law and Its Applications

Appeared in Year: 2012

MCQ▾

Question

Three charges are located on the circumference of a circle of radius R as shown in the figure below. The two charges Q subtend an angle 900 at the centre of the circle. The charge q is symmetrically placed with respect to the charges Q. If the electric field at the centre of the circle zero, what is the magnitude of Q? (December)

Three charges located on a circle

Three Charges Located on a Circle

In figure three charges are located on the circumference of a circle of radius R. The two charges Q subtend an angle 900 at the centre of the circle. The charge q is symmetrically placed with respect to the charges Q.

Choices

Choice (4) Response

a.

2q

b.

4q

c.

q2

d.

2q

Question number: 6

» Electromagnetic Theory » Electrostatics: Gauss's Law and Its Applications

Appeared in Year: 2014

MCQ▾

Question

A charged particle is at a distance d from an infinite conducting plane maintained at zero potential. When released from rest, the particle reaches a speed u at a distance d2 from the plane. At what distance from the plane will the particle reach the speed 2u ? (June)

Choices

Choice (4) Response

a.

d6

b.

d5

c.

d3

d.

d4

Question number: 7

» Electromagnetic Theory » Interference

Appeared in Year: 2012

MCQ▾

Question

Consider the interference of two coherent electromagnetic waves whose electric field vectors are given by E1=i^E0cosωt and E2=j^E0cos(ωt+ϕ) where ϕ is the phase difference. The intensity of the resulting wave is given by ε02E2 , where E2 is the time average of E2 . The total intensity is – (December)

Choices

Choice (4) Response

a.

ε0E02cos2ϕ

b.

ε0E02sin2ϕ

c.

0

d.

ε0E02

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