Electrostatics (NEET Physics): Questions 73 - 76 of 107

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Question number: 73

» Electrostatics » Electrostatic Potential Energy

MCQ▾

Question

If identical charges (-q) are placed at each corner of a cube of side b , then electric potential energy of charge (+q) which is placed at center of the cube will be

Choices

Choice (4) Response
a.

42q2πϵ0ba

b.

82q2πϵ0b

c.

4q23πϵ0b

d.

82q24πϵ0b

Question number: 74

» Electrostatics » Capacitors

MCQ▾

Question

Figure given below shows two identical parallel plate capacitors connected to a battery with switch S closed. The switch is now opened and the free space between the plates of capacitors is filled with a dielectric of dielectric constant 3. What will be the ratio of total electrostatic energy stored in both capacitors before and after the introduction of the dielectric?

Circuit Diagram - Two identical parallel plate capacitors

Circuit Diagram - Two Identical Parallel Plate Capacitors

Two identical parallel plate capacitors connected to a battery with switch S closed.

Choices

Choice (4) Response
a.

5: 1

b.

3: 1

c.

3: 5

d.

5: 3

Question number: 75

» Electrostatics » Electric Potential

MCQ▾

Question

The distance between H + and CI - ions in HCl molecule is 1.28. What will be the potential due to this dipole at a distance of 12 on the axis of dipole?

Choices

Choice (4) Response
a.

13 V

b.

130 V

c.

1.3 V

d.

0.13 V

Question number: 76

» Electrostatics » Coulomb's Law

MCQ▾

Question

Electric charges of 1μC, -1μC and 2μC are placed in air at the corners A, B and C respectively of an equilateral triangle ABC having length of each side 10 cm. The resultant force on the charge at C is

Choices

Choice (4) Response
a.

3.6 N

b.

2.7 N

c.

1.8 N

d.

0.9 N

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