Two point masses each equal to 1 kg attract one another with force of 10−10N. The distance between the two point masses is (G=6.6×10−11MKS units)
8cm
0.8cm
80cm
0.08cm
A
8cm
B
0.08cm
C
0.8cm
D
80cm
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Solution
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According to newton's Gravitational Law Fg=GM1M2r2 here Fg=10−10 Newton, m1=m2=1kg, G=6.6×10−11 So r2=GM1M2Fg=6.6×10−11×1×110−10=0.66 or r=0.8125 metre =81.25cm=80cm
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