Q.

A point mass m and a uniforms thin rod (mass M and length L) are shown in figure. Find the gravitational force of attraction between them

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a

GMmah

b

4GMm(2a+L)2

c

GMma(a+L)

d

GMm(a+L)2

answer is B.

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Detailed Solution

Consider a small element in the Rod whose mass dm=MLdx

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The force between the point mass and element is

df=Gmdmx2=GmMLdxx2

F=aa+LdF=aa+LGmmLdxx2F=GMma(a+L)

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