Electromagnetic Theory [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 71 - 74 of 88

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Question 71

Appeared in Year: 2007

Question

MCQ▾

A vector field is defined everywhere as . The net flux of associated with a cube of side , with one vertex at the origin and sides along the positive and axes, is –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 72

Appeared in Year: 2008

Question

MCQ▾

A heavy nucleus is found to contain more neutrons than protons. This fact is related to which one of the following statements?

Choices

Choice (4)Response

a.

Protons are unstable, so their number in a nucleus diminishes

b.

The nuclear force between neutrons is stronger than that between protons

c.

The nuclear force between protons is of a shorter range than those between neutrons, so that a smaller number of protons are held together by the nuclear force.

d.

It costs more energy to add a proton to a (heavy) nucleus that a neutron because of the Coulomb repulsion between protons.

Passage

A sphere of radius carries a polarization , where is a constant and is measured from the centre of the sphere.

Question 73 (1 of 2 Based on Passage)

Appeared in Year: 2007

Question

MCQ▾

The bound surface and volume charge densities are given, respectively, by –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 74 (2 of 2 Based on Passage)

Appeared in Year: 2007

Question

MCQ▾

The electric field at a point outside the sphere is given by –

Choices

Choice (4)Response

a.

b.

c.

d.

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