A solid non conducting sphere of radius r having a spherical cavity of radius r/2
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Occupied volume= (4/3 x pi x r^3) - ( 4/3 x pi × (r/3)^3 )
= 4/3 × pi x r^3 x (1- 1/8)
= 4/3 × pi x r^3 x 7/8
= 7/6 × pi x r^3
= (7/6) × (22/7) x r^3
= (11/3) x (r^3).
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