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Physics-

General

Easy

Question

A sphere of mass M and radius R₂ has a concentric cavity of radius R₁ as shown in figure. The force F exerted by the sphere on a particle of mass m located at a distance r from the centre of sphere varies as $left parenthesis 0 less or equal than r less or equal than infinity right parenthesis$

The correct answer is:

$F equals 0$ when $0 less or equal than r less or equal than R subscript 1 end subscript$
because intensity is zero inside the cavity.
F increase when $R subscript 1 end subscript less or equal than r less or equal than R subscript 2 end subscript$
$F proportional to fraction numerator 1 over denominator r to the power of 2 end exponent end fraction$ when $r greater than R subscript 2 end subscript$

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