GATE (Graduate Aptitude Test in Engineering) Physics: Questions 80 - 82 of 622

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Question number: 80

» Electromagnetic Theory » Biot - Savart's and Ampere's Laws

Appeared in Year: 2015

MCQ▾

Question

A charge Equation is distributed uniformly over a sphere, with a positive charge Equation at its centre in Equation . Also in Equation , a charge Equation is distributed uniformly over an ellipsoid with a positive charge Equation at its centre. With respect to the origin of the coordinate system, which one of the following statements is correct?

Charge distribution over sphere and ellipsoid

Charge Distribution Over Sphere and Ellipsoid

In figure – i uniform charge distribution over a sphere and in figure – ii uniform charge distribution over an ellipsoid.

Choices

Choice (4) Response

a.

The dipole moment is non – zero in both figure (i) and figure (ii)

b.

The dipole moment is non – zero in figure (i) but zero in figure (ii)

c.

The dipole moment is zero in figure (i) but non – zero in figure (ii)

d.

The dipole moment is zero in both figure (i) and figure (ii)

Question number: 81

» 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 Equation . The corresponding amplitude of the electric field of the laser is Equation . Equation

Question number: 82

» Mathematical Physics » Vector Calculus

Appeared in Year: 2014

Short Answer Question▾

Write in Short

If the vector potential

Equation satisfies the Coulomb gauge, the value of the constant Equation is ________.

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