Electromagnetic Theory (CSIR Physical Sciences): Questions 1 - 4 of 57

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Question number: 1

» Electromagnetic Theory » Scalar and Vector Potentials

Appeared in Year: 2013

MCQ▾

Question

If the electric and magnetic field are unchanged when the vector potential A changes (in suitable units) according to AA+r^ , where r=r(t)r^, then the scalar potential Φ must simultaneously change to – (June)

Choices

Choice (4) Response

a.

Φ+r

b.

Φrt

c.

Φr

d.

Φ+rt

Question number: 2

» Electromagnetic Theory » Magnetostatics » Ampere's Theorem

Appeared in Year: 2013

MCQ▾

Question

The force between two long and parallel wires carrying I1 and I2 and separated by distance D is proportional to – (December)

Choices

Choice (4) Response

a.

I1I2D2

b.

I1+I2D

c.

(I1I2D)2

d.

I1I2D

Question number: 3

» Electromagnetic Theory » Gauge Invariance

Appeared in Year: 2013

MCQ▾

Question

The components of a vector potential Aμ(A0,A1,A2,A3) are given by,

Aμ=k(xyz,yzt,zxt,xyt)

Where k is a constant. The three component of the electric field are – (June)

Choices

Choice (4) Response

a.

(0,0,0)

b.

k(xt,yt,zt)

c.

k(yz,zx,xy)

d.

k(x,y,z)

Question number: 4

» Electromagnetic Theory » Dynamics of Charged Particles in Static Electromagnetic Field

Appeared in Year: 2014

MCQ▾

Question

A charged particle moves in a helical path under the influence of a constant magnetic field. The initial velocity is such that the component along the magnetic field is twice the component in the plane normal to magnetic field.

A charged particle moves in a helical path

A Charged Particle Moves in a Helical Path

Figure shows a charged particle moves in a helical path under the influence of a constant magnetic field.

The ratio lR of the pinch l to the radius R of the helical path is –

(December)

Choices

Choice (4) Response

a.

2π

b.

π

c.

4π

d.

π2

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