# Electrostatics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 28 - 31 of 109

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## Question number: 28

» Electrostatics » Electrostatic Potential Energy

MCQ▾

### Question

Two charges q 1 and q 2 are placed 30 cm apart, shown in the figure. A third charge q 3 is moved along the arc of a circle of radius 40 cm from C to D. The change in the electrostatic potential energy of the system is . What will be P?

### Choices

Choice (4) Response

a.

8 q 2

b.

8 q 1

c.

6q 2

d.

6 q 1

## Question number: 29

» Electrostatics » Electric Charges

MCQ▾

### Question

the magnitude of electric field intensity E is such that, when an electron placed in it, electron would experience an electrical force is equal to its weight is given by mg. So, what is the magnitude of this electric field?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 30

» Electrostatics » Capacitors

MCQ▾

### Question

A parallel plate capacitor is charged to a potential. difference of 50V. It is discharged through a resistance. After 1 second, the potential difference between plates becomes 40V. Then

### Choices

Choice (4) Response

a.

Potential difference between the plates after 2 seconds will be 20 V

b.

Fraction of stored energy after 1 second is 16/25

c.

Potential difference between the plates after 2 seconds will be 30V

d.

Fraction of stored energy after 1 second is 4/5

## Question number: 31

» 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

### Choices

Choice (4) Response

a.

b.

c.

d.

All of the above

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