# Electrostatics (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 3 - 5 of 13

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## Question number: 3

» Electrostatics » Forces Between Multiple Charges

Appeared in Year: 2010

MCQ▾

### Question

Three equal charges + q are placed at the three vertices of an equilateral triangle centered at the origin. They are held in equilibrium by a restoring force of magnitude F (r) = Kr directed towards the origin, where k is a constant. What is the distance of the three charges from the origin?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 4

» Electrostatics » Capacitors

Appeared in Year: 2012

MCQ▾

### Question

The capacitor of capacitance C in the circuit shown is fully charged initially, Resistance is R.

After the switch S is closed, the time taken to reduce the stored energy in the capacitor to half its initial value is:

### Choices

Choice (4) Response

a.

Cln 2

b.

c.

d.

## Question number: 5

» Electrostatics » Forces Between Two Point Charges

Appeared in Year: 2013

MCQ▾

### Question

Consider an initially neutral hollow conducting spherical shell with inner radius r and outer radius 2r. A point charge + Q is now placed inside the shell at a distance from the centre. The shell is then grounded by connecting the outer surface to the earth. P is an external point at a distance 2r from the point charge + Q on the line passing through the centre and the point charge + Q as shown in the figure.

The magnitude of the force on a test charge + q placed at P will be –

### Choices

Choice (4) Response

a.

b.

c.

0

d.

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