CSIR Physical Sciences: Questions 18 - 21 of 401

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Question number: 18

» Quantum Mechanics » Motion in Central Potential » Angular Momentum Algebra

Appeared in Year: 2013

MCQ▾

Question

A particle moves in a potential V=x2+y2+z22 . Which component (s) of the angular momentum is/are constant (s) of motion? (December)

Choices

Choice (4) Response

a.

OnlyLxandLy

b.

OnlyLz

c.

Lx,LyandLz

d.

Question does not provide sufficient data or is vague

Question number: 19

» Classical Mechanics » Special Theory of Relativity » Relativistic Kinematics

Appeared in Year: 2013

MCQ▾

Question

The area of a disc in its rest frame S is equal to 1 (in some units). The disc will appear distorted to an observer O moving with a speed u with respect to S along the plane of the disc. The area of the disc measured in the rest frame of the observer O is (c is the speed of light in vacuum) (June)

Choices

Choice (4) Response

a.

(1u2c2)

b.

(1u2c2)12

c.

(1u2c2)12

d.

(1u2c2)1

Question number: 20

» 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: 21

» 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

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