KVPY SX SB Exam 2013 Question Paper

Question : 21 of 120

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PHYSICS

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

r/2

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

$1/{4πε_0}{\qQ}/{4\r^2}$
$1/{4πε_0}{9\qQ}/{100\r^2}$
$1/{4πε_0}{4\qQ}/{25\r^2}$
0

Validate

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