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Two lead spheres of 20 cm and 2 cm diame...

Two lead spheres of `20 cm` and `2 cm` diametre respectively are planet with centres `100 cm` apart. Calculate the attraction between them, given the radius of the Earth as `6.37 xx 10^(8) cm` and its mean density as `5.53 xx 10^(3) kg m^(-3)`. Speciffic gravity of lead `= 11.5`. If the lead spheres are replaced by bress sphere of the same radii, would the force of attraction be the same?

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The correct Answer is:
`1.5 xx 10^(-10)N`
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