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Q.

Which of the following is an example of non-contact forces?


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a

Gravitational force

b

Magnetic force

c

Frictional force

d

Both 1 & 2 

answer is C.

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Detailed Solution

The correct option is 4.
A non-contact force is a force which does not require the condition that the two objects must be in contact for the force to act. Non-contact forces play when objects do not have physical contact between them or when a force is applied without any interaction. In gravitational force, earth attracts every body towards itself whether the body is in contact with the earth or not. Also, magnetic force is exerted between two bodies whether they are in contact or not. So, the gravitational and magnetic force are non-contact forces.
 
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