Electrostatics-Coulomb's Law (NEET Physics): Questions 1 - 4 of 9

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Question number: 1

» Electrostatics » Coulomb's Law

MCQ▾

Question

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. Calculate the Coulomb force F between proton and electron. (here k=14πϵ0)

Choices

Choice (4) Response

a.

Ke2r3r^

b.

Ke2r3r^

c.

Ke2r3r

d.

All of the above

Question number: 2

» Electrostatics » Coulomb's Law

MCQ▾

Question

Two small balls each having the charge + Q are suspended by insulating threads of length L from a hook. This arrangement is taken in space where there is no gravitational effect, then the angle between the two suspensions and the tension in each thread will be,

Choices

Choice (4) Response

a.

1800,14πϵQ222

b.

1800,14πϵQ2L2

c.

1800,14πϵQ2(2L)2

d.

900,14πϵQ2(L)2

Question number: 3

» Electrostatics » Coulomb's Law

MCQ▾

Question

A total charge Q is broken in two parts Q 1 and Q 2 and they are placed at a distance R from each other. The maximum force of repulsion between them will occur, when

Choices

Choice (4) Response

a.

Q1=QR,Q2=QR

b.

Q2=Q4,Q1=Q2Q3

c.

Q2=QR,Q1=QQR

d.

Q2=Q4,Q1=Q3Q4

Question number: 4

» Electrostatics » Coulomb's Law

MCQ▾

Question

Equal charges q are placed at the four corners A, B, C, D of a square of length a. The magnitude of the force on the charge at B will be

Choices

Choice (4) Response

a.

q2πϵ0a2

b.

3q24πϵ0a2

c.

(1+222)q24πϵ0a2

d.

(2+12)q24πϵ0a2

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