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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

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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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