Q.

Gravitational force is a central force which is always conservative. Which of the following forces is noncentral and conservative in nature?

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a

Electrostatic force

b

Magnetic force on a free charge particle

c

Spring force

d

Force due to friction

answer is C.

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Detailed Solution

The spring force is represented by F→=-kx→, which is non central. But the work done in a round trip under this force field will be zero. Hence it is conservative.
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