Four identical particles of equal masses 1   kg made to move along the circumference of a circle of…

Four identical particles of equal masses 1 kg made to move along the circumference of a circle of radius 1 m under the action of their own mutual gravitational attraction. The speed of each particle will be:
  1. G1+22
  2. G21+22
  3. G222-1
  4. 1+22G2

Solution

F1=Gmm2R2=Gm24R2

 F2=Gmm2R2=Gm22R2

 F3=Gmm2R2=Gm22R2

Fnet=F1+F2cos45°+F3cos45°

=Gm24R2+Gm22R212+Gm22R212

=Gm2R214+12=Gm24R21+22

Fnet=Gm24R21+22=mv2R

v=G1+222

Asked in: JEE Main 2021 (24 Feb Shift 1)

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