Electromagnetic Theory-Radiation- From Moving Charges (CSIR Physical Sciences): Questions 1 - 3 of 4

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Question number: 1

» Electromagnetic Theory » Radiation- From Moving Charges

Appeared in Year: 2014

MCQ▾

Question

A non – relativistic particle of mass m and charge e, moving with a velocity v and acceleration a , emits radiation of intensity I . What is the intensity of the radiation emitted by a particle of mass m2, charge 2e , velocity v2 and acceleration 2a ? (December)

Choices

Choice (4) Response

a.

8I

b.

2I

c.

16I

d.

4I

Question number: 2

» 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: 3

» Electromagnetic Theory » Radiation- From Moving Charges

Appeared in Year: 2014

MCQ▾

Question

An electromagnetically – shielded room is designed so that at a frequency ω=107rads the intensity of the external radiation that penetrates the room is 1 % of the incident radiation. If σ=12π×106(Ωm)1 is the conductivity of the shielding material, its minimum thickness should be –

(Given that ln10=2.3 ) (June – 2014)

Choices

Choice (4) Response

a.

0.46mm

b.

0.23mm

c.

4.60mm

d.

2.30mm

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