# Electrostatics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 38 - 42 of 109

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## Passage

Capacitor C 3 in the circuit is variable capacitor (its capacitance can be varied). Graph is plotted between potential differences V, (across capacitor C 1) versus C 3, Electric potential V 1 approaches on asymptote of 10 volts as C 3 → ∞

## Question number: 38 (3 of 3 Based on Passage) Show Passage

» Electrostatics » Capacitors

MCQ▾

### Question

The value of C 3 for which potential difference across C 1 will become 8V, is

### Choices

Choice (4) Response

a.

4.5 C 1

b.

1.5 C 1

c.

2.5 C 1

d.

3.5 C 1

## Question number: 39

» 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.

b.

c.

d.

## Question number: 40

» Electrostatics » Capacitors

MCQ▾

### Question

Eight drops of mercury of equal radii possessing equal charges combine to form a big drop. Then the capacitance of bigger drop Compared to each individual small drop is

### Choices

Choice (4) Response

a.

8 times

b.

2 times

c.

4 times

d.

32 times

## Question number: 41

» Electrostatics » Electrostatic Potential Energy

MCQ▾

### Question

Three particles, each having a charge of 10µC are placed at the corners of an equilateral triangle of side 10 cm. What is the electrostatic potential energy of the system? ( = 9xl0 9 Nm 2 /C 2)

### Choices

Choice (4) Response

a.

Zero

b.

27 J

c.

Infinite

d.

100 J

## Question number: 42

» Electrostatics » Electric Potential

MCQ▾

### Question

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

Then which option are correct:

(1) Total charge within 2R 0 is q

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

(3) At electric potential is discontinuous

(4) There will be no charge anywhere except at

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

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