For the path PQR in a conservative force field (figure), the amount of work done in carrying a body from P to Q & from Q to R are 3J & 2J respectively. The work done in carrying the body from P to R will be
A
7J
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B
3J
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C
5J
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D
zero
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Solution
The correct option is C5J We know, work done by conservative force is independent of path. ∴ Work done (from P to R) = Work done (from P to Q) + Work done (from Q to R) =3 J+2 J=5 J