Electromagnetic Theory (CSIR Physical Sciences): Questions 40 - 42 of 55

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Question number: 40

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

Appeared in Year: 2013

MCQ▾

Question

A point charge q is placed symmetrically at a distance d from two perpendicularly placed grounded conducting infinite plates as shown in the figure. The net force on the charge (in units of 14πε0 ) is –

A point charge placed between two perpendicular plates

A Point Charge Placed Between Two Perpendicular Plates

In figure a point charge q is placed symmetrically at a distance d from two perpendicularly placed grounded conducting infinite plates.

(December – 2013)

Choices

Choice (4) Response
a.

3q28d2 away from the corner

b.

q28d2(221) away from the corner

c.

q222d2 towards the corner

d.

q28d2(221) towards the corner

Question number: 41

» 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

Question number: 42

» Electromagnetic Theory » Reflection and Refraction

Appeared in Year: 2014

MCQ▾

Question

A beam of light of frequency ω is reflected from a dielectric – metal interface at normal incidence. The refractive index of the dielectric medium is n and that of the metal is n2=n(1+iρ) . If the beam is polarized parallel to the interface, then the phase change experienced by the light upon reflection is – (June – 2014)

Choices

Choice (4) Response
a.

tan1(2ρ)

b.

tan1(1ρ)

c.

tan(2ρ)

d.

tan1(2ρ)

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