First slide

Universal law of gravitation

Question

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

Easy

A

Electrostatic force
B

Magnetic force on a free charge particle
C

Spring force
D

Force due to friction

Solution

The spring force is represented by $\vec{F} = - k \vec{x}$ , 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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