Electromagnetic Theory-Energy and Momentum of Electromagnetic Waves (GATE (Graduate Aptitude Test in Engineering) Physics): Questions 1 - 3 of 5

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Question number: 1

» Electromagnetic Theory » Energy and Momentum of Electromagnetic Waves

Appeared in Year: 2014

Short Answer Question▾

Write in Short

The intensity of a laser in free space is . The corresponding amplitude of the electric field of the laser is .

Question number: 2

» Electromagnetic Theory » Energy and Momentum of Electromagnetic Waves

Appeared in Year: 2012

MCQ▾

Question

The space – time dependence of the electric field of a linearly polarized light in free space is given by where and are the amplitude, the angular frequency and the wavevector, respectively. The time average energy density associated with the electric field is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 3

» Electromagnetic Theory » Energy and Momentum of Electromagnetic Waves

Appeared in Year: 2010

MCQ▾

Question

Two magnetic dipole of magnitude each are placed in a plane as shown. The energy of interaction is given by –

Angle α Angle α: Angle between A, B, CAngle β Angle β: Angle between B, C, ASegment f Segment f: Segment [A, B] Segment g Segment g: Segment [A, C] Segment h Segment h: Segment [C, B] Vector u Vector u: Vector [D, E] Vector u Vector u: Vector [D, E] Vector v Vector v: Vector [B, F] Vector v Vector v: Vector [B, F] Point A A = (-0.76,4.24) Point A A = (-0.76,4.24) 45degree text1 = “45degree”45degree text1 = “45degree”45degree text1 = “45degree”45degree text1_1 = “45degree”45degree text1_1 = “45degree”45degree text1_1 = “45degree”1 text2 = “1”2 text2_1 = “2”m text2_2 = “m”m text2_3 = “m”

Two Magnetic Dipoles

In figure two magnetic dipoles are placed.

Choices

Choice (4) Response

a.

b.

c.

d.

Zero

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