Questions
A mass m is placed at point P which lies on the axis of a ring of mass M and radius R at a distance R from its centre. The gravitational force on mass m is
a
GMm2R2
b
GMm2R2
c
GMm22R2
d
GMm4R2
detailed solution
Correct option is C
The situation is as shown in the figure.Gravitational force on an object of mass m at point P at distance d from centre O lying on the axis of the circular ring of radius R and mass M is given byF=GMmdR2+d23/2When d = R, then F=GMmRR2+R23/2=GMmR2R23/2=GMmR23/2R3=GMm22R2Talk to our academic expert!
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