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This section contains a paragraph. Based upon this paragraph, three multiple- choice question (21-23) have to be answered. Each question has four choices (a,b,c and d), out of which only one is correct. The result obtained in electrostatics using Gauss's law can in same cases be used to obtain result in gravitational, and vice versa. This is because both follow the inverse- square law of distance. We use of 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=(4piepsi_(0))^(-1) of electrostatics corresponds to -G in gravitation. The gravitational intensity at a distance r from a long thread having lambda mass per unit length has the magnitude |
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Answer» `lambdaG//r` |
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