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Question

# An object is taken from a point P to another point Q in a gravitational field.

A
Assuming the earth to be spherical, if both P and Q lie on the earth's surface, the work done is zero
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B
If P is on the earth's surface and Q above it, the work done is minimum when it is taken along the straight line PQ
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C
The work done depends only on the position of P and Q and is independent of the path along which the particle is taken
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D
There is no work done if the object is taken from P to Q and then brought back to P along any path
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Solution

## The correct options are A Assuming the earth to be spherical, if both P and Q lie on the earth's surface, the work done is zero C The work done depends only on the position of P and Q and is independent of the path along which the particle is taken D There is no work done if the object is taken from P to Q and then brought back to P along any pathGravitational field is conservative ⇒work done to move an object in closed loop=0And work done in moving a mass from one location to another is independent of path.∴A,C and D are correct.

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