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Question

For the path PQR in a conservative force field, the amount of work done in carrying a body from P to Q & from Q to R are 5J & 2J respectively. The work done in carrying the body from P to R will be?
1210512_7f2fd48f29c3467091167346f8b70025.png

A
7J
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B
3J
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C
21J
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D
Zero
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Solution

The correct option is A 7J
Workdone in closed path is zero.
WPtoQ+WQtoR+WRtoP=0

2+5+WRtoP=0WRtoP

WRtoP=7

WPtoR=WRtoP=(7)=7J

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