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The results obtained in electrostatics using Gauss’s law can in some cases be used to obtain results in gravitation, and vice versa. This is because both follow the inverse-square law of distance. We use the following three rules:  (1) For charge in electrostatics, the corresponding quantity in gravitation is mass.  (2) Electric intensity of electrostatics corresponds to gravitational intensity, or acceleration due to gravity, in gravitation. (3) The constant k = (4πε0)-1 of electrostatics corresponds to -G in gravitation.The gravitational intensity at a distance r from a long thread having λ mass per unit length has the magnitude(a) λG/r (b) 2λG/r (c) λG/2r (d) λG/2πr

Answer»

Correct Answer is: (a) λG/r 



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