Electromagnetic Theory (CSIR Physical Sciences): Questions 43 - 45 of 57

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Question number: 43

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

Appeared in Year: 2013

MCQ▾

Question

Let four point charges q,q2,qandq2 be placed at the vertices of a square of side a . Let another point charge q be placed at the centre of the square (see the figure)

4charges placed at the vertices of a square & 1 point at centre

4charges Placed at the Vertices of a Square & 1 Point at Centre

In figure four charges placed at the vertices of a square and one point charge is placed at the centre of the square.

Let V(r) be the electrostatic potential at a point P at a distance ra from the centre of the square. Then V(2r)V(r) is – (December – 2013)

Choices

Choice (4) Response

a.

18

b.

14

c.

1

d.

12

Question number: 44

» Electromagnetic Theory » Lorentz Invariance of Maxwell's Equation

Appeared in Year: 2012

MCQ▾

Question

Which of the following quantities is Lorentz invariant? (June)

Choices

Choice (4) Response

a.

E×B 2

b.

E 2 B 2

c.

E 2+ B 2

d.

E 2 B 2

Question number: 45

» Electromagnetic Theory » Radiation- From Moving Charges

Appeared in Year: 2012

MCQ▾

Question

When a charged particle emits electromagnetic radiation, the electric field E and the Poynting vector S=1μ0E×B at a large distance r from the emitter vary as 1rn and 1rm respectively. Which of the following choices for n and m are correct? (December)

Choices

Choice (4) Response

a.

n=1andm=1

b.

n=1andm=2

c.

n=2andm=4

d.

n=2andm=2

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