Which of the following is not a non-contact force?

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Gravitational force

Frictional force

Electrostatic force

Magnetic Force

answer is C.

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Detailed Solution

A magnet can exert a force on another magnet or magnetic material even when they are not in contact.
The electrostatic force is the force exerted by a charged body on another charged body. These charged bodies need not be in contact.
The gravitational force is exerted between objects having some mass and these bodies need not be in contact. For example, the force exerted by the earth on the moon.
Frictional force is exerted when the surfaces of two bodies come in contact with each other.

Therefore, frictional force is not a non-contact force.

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