Two stationary particles of masses M1 and M2 are at distance d apart. A third particle, lying on the line joining the particles, experiences no resultant gravitational force. The distance of this particle from M1 is
d(√M2√M1−√M2)
d(√M1√M1+√M2)
d(√M1√M1−√M2)
d(M1M1+M2)
A
d(√M1√M1+√M2)
B
d(√M2√M1−√M2)
C
d(√M1√M1−√M2)
D
d(M1M1+M2)
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Solution
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Force on m towards M1, F1=GM1mr2 Force on m towards M2, F2=GM2m(d−r)2 As there is no resultant force ∣∣→F1∣∣=∣∣→F2∣∣ ⇒GM1mr2=GM2m(d−r)2 ⇒(d−rr)2=M2M1 ⇒dr−1=√M2√M1 dr=√M2+√M1√M1 ⇒r=d[√M1√M1+√M2]
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