Electrostatics (NEET Physics): Questions 42 - 44 of 107

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Question number: 42

» Electrostatics » Electric Potential

MCQ▾

Question

For spherical symmetrical charge distribution, variation of electric potential with distance from center is given in V=q4πϵ0R0forrR0 and V=q4πϵ0rforrR0 ,

Curve of potential → distance (r)

Curve of Potential → Distance (R)

Curve shows that from o to r = R0 potential becomes constant and from r > R0, it decays

Then which option are correct:

(1) Total charge within 2R 0 is q

(2) Total electrostatic energy for rR0 is non-zero.

(3) At r=R0 electric potential is discontinuous

(4) There will be no charge anywhere except at r<R0

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response
a.

1 and 3

b.

1, 2 and 4

c.

2 and 4

d.

1 and 2

Question number: 43

» Electrostatics » Electrostatic Potential Energy

MCQ▾

Question

Three charges of equal value q’ are placed at the vertices of an equilateral triangle. What is the net potential energy, if the side of equilateral triangle is l?

Choices

Choice (4) Response
a.

14πϵ03q2l

b.

-14πϵ0q2l

c.

14πϵ02q2l

d.

14πϵ04q2l

Question number: 44

» 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

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