Electromagnetic Theory (CSIR Physical Sciences): Questions 49 - 52 of 57

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Question number: 49

» Electromagnetic Theory » Gauss Law and Applications

Appeared in Year: 2012

MCQ▾

Question

An infinite solenoid with its axis of symmetry along the z – direction carries a steady current I .

An infinite solenoid

An Infinite Solenoid

In figure an infinite solenoid with its axis of symmetry along the z – direction carries a steady current.

The vector potential A at a distance R from the axis, (December)

Choices

Choice (4) Response

a.

Varies as 1R inside and as R outside the solenoid

b.

Varies as R inside and is constant outside the solenoid

c.

Is constant inside and varies as R outside the solenoid

d.

Varies as R inside and as 1R outside the solenoid

Passage

The magnetic field of the TE11 mode of a rectangular waveguide of dimensions a×b as shows in the figure is given by Hz=H0cos(0.3πx)cos(0.4πy) , where x and y are in cm.

 The magnetic field of a mode of a rectangular waveguide

the Magnetic Field of a Mode of a Rectangular Waveguide

In figure the magnetic field of a mode of a rectangular waveguide is shown.

Question number: 50 (1 of 2 Based on Passage) Show Passage

» Electromagnetic Theory » Electromagnetic Waves in Free Space

MCQ▾

Question

The dimensions of the waveguide are –

Choices

Choice (4) Response

a.

a=0.80cm,b=0.60cm

b.

a=1.66cm,b=1.25cm

c.

a=3.33cm,b=2.50cm

d.

a=0.40cm,b=0.30cm

Question number: 51 (2 of 2 Based on Passage) Show Passage

» Electromagnetic Theory » Electromagnetic Waves in Free Space

MCQ▾

Question

The entire range of frequencies f for which the TE11 mode will propagate is:

Choices

Choice (4) Response

a.

7.5GHz<f<9.0GHz

b.

6.0GHz<f<7.5GHz

c.

7.5GHz<f<12.0GHz

d.

7.5GHz<f

Question number: 52

» Electromagnetic Theory » Scalar and Vector Potentials

Appeared in Year: 2011

MCQ▾

Question

A constant electric current I in an infinitely long straight wire is suddenly switched on at t=0 . The vector potential at a perpendicular distance r from the wire is given by A=k^μ0I2πln[1r(ct+c2t2r2)] . The electric field at a distance r(<ct) is –

(December)

Choices

Choice (4) Response

a.

cμ0I2πc2t2r212(i^j^)

b.

μ0I2πt12(i^j^)

c.

0

d.

cμ0I2πc2t2r2k^

f Page
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