Q.

Which of the following is/are non-contact forces?


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a

Magnetic force

b

Electrostatic force

c

Gravitational force

d

All of the above 

answer is D.

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Detailed Solution

Magnetic force, electrostatic force, and gravitational forces are non-contact forces.
The forces acting on the body without coming in contact with each other are called non-contact forces. Non-contact forces include gravitational force, magnetic force and electrostatic force. Gravitational force can even act if the object is in the air and not on the surface. The magnetic force acts on the object when bought into the magnetic field. Similarly, The electrostatic force acts on the object brought into the electric field.
 
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