Electromagnetic Theory (CSIR Physical Sciences): Questions 37 - 39 of 57

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Question number: 37

» Electromagnetic Theory » Radiation- From Moving Charges

Appeared in Year: 2013

MCQ▾

Question

An oscillating current I(t)=I0exp(iωt) flows in the direction of the y – axis through a thin metal sheet of area 1.0cm2 kept in the xy plane. The rate of total energy radiated per unit area from the surfaces of the metal sheet at a distance of 100 m is – (June – 2013)

Choices

Choice (4) Response

a.

I02ω12πε0c3

b.

I02ω212πε0c3

c.

I0ω12πε0c3

d.

I0ω224πε0c3

Question number: 38

» Electromagnetic Theory » Laplace and Poisson Equations

Appeared in Year: 2013

MCQ▾

Question

If the electrostatic potential V(r,θ,ϕ) in a charge free region has the form V(r,θ,ϕ)=f(r)cosθ , then the functional form of f(r) (in the following a and b are constants) is – (December – 2013)

Choices

Choice (4) Response

a.

ar+br2

b.

aln(rb)

c.

ar2+br

d.

ar+br

Question number: 39

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

Appeared in Year: 2014

MCQ▾

Question

A charge (e) is placed in vacuum at the point (d,0,0) ; where d>0 . The region x0 is filled uniformly with a metal. The electric field at the point (d2,0, 0) is – (June – 2014)

Choices

Choice (4) Response

a.

10e9πε0d2(1, 0,0)

b.

eπε0d2(1, 0,0)

c.

10e9πε0d2(1, 0,0)

d.

eπε0d2(1, 0,0)

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