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Three particle of mass m each are placed...

Three particle of mass m each are placed at the three corners of an equilateral triangle of side a. Find the work which should be done on this system to increase the sides of the triangle to 2a.

Text Solution

Verified by Experts

The correct Answer is:
A, B, C
`W = DeltaU = U_(f) - U_(i)`
`= 3[(-Gmm)/(2a)] -3 [(-Gmm)/(a)]`
`= (3 Gmm)/(2a) = (3 Gm^(2))/(2a)`
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Knowledge Check

  • Three particle each of mass m are placed at the corners of equilateral triangle of side l Which of the following is/are correct ?

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    B
    Moment of inertia about axis '2' is `(3)/(4)ml^(2)`
    C
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    B
    `(-Gm^(2))/(2b)`
    C
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