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Question

_________ always opposes the relative motion of a body.

A
Electrostatic force
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B
Frictional force
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C
Magnetic force
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D
Muscular force
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Solution

The correct option is B Frictional force
Frictional force is a contact force. It always opposes the relative motion between two bodies. When a body is changing its position with respect to any other body, it is termed as relative motion.

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