Two spheres of masses 16kg and 4kg are separated by a distance 30m on a table. Then the distance from sphere of mass 16kg at which the net gravitational force becomes zero is:
A
10m
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B
20m
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C
15m
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D
5m
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Solution
The correct option is B20m Gravitational force on a mass m at a distance x from 16kg mass is 16Gmx2.
Gravitational force on the mass due to 4kg in the opposite direction is 4Gm(30−x)2