Electrostatics-Forces Between Two Point Charges (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 1 - 1 of 1

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Question number: 1

» 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 r2 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.

A hollow conducting spherical shell

A Hollow Conducting Spherical Shell

Figure shows, a hollow conducting spherical shell with inner radius r and outer radius 2r. A point charge + Q is placed inside the shell at a distance r/2 from center and P is an external point at distance 2r from the point charge + Q.

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

Choices

Choice (4) Response

a.

14πε04qQ25r2

b.

14πε0qQ4r2

c.

0

d.

14πε09qQ100r2

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