# Electromagnetic Theory (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 46 - 49 of 68

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## Question number: 46

» Electromagnetic Theory » Scalar and Vector Potentials

Appeared in Year: 2012

MCQ▾

### Question

The vector potential due to a magnetic moment at a point is given by . If is directed along the positive z – axis, the x – component of the magnetic field, at the point , is – (June)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 47

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

Appeared in Year: 2012

MCQ▾

### Question

Charges Q, Q and -2Q are placed on the vertices of an equilateral triangle ABC of sides of length , as shown in the figure

The dipole moment of this configuration of charges, irrespective of the choice of origin, is – (June)

### Choices

Choice (4) Response

a.

b.

0

c.

d.

## Question number: 48

» Electromagnetic Theory » Scalar and Vector Potentials

Appeared in Year: 2012

MCQ▾

### Question

Consider an infinite conducting sheet in the XY – plane with a time dependent current density , where K is constant. The vector potential at is given by . The magnetic field is –

(December)

### Choices

Choice (4) Response

a.

b.

c.

d.

## 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 .

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

### Choices

Choice (4) Response

a.

Varies as 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 outside the solenoid

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