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Question

Which of the following statements are correct about magnetic and electrostatic forces?


A

They are contact forces.

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B

Like charges/poles repel each other.

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C

Unlike charges/poles attract each other.

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D

They are non-contact forces.

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Solution

The correct options are
B

Like charges/poles repel each other.


C

Unlike charges/poles attract each other.


D

They are non-contact forces.


Contact forces are those for which to act, physical contact is necessary. On the other hand, non-contact forces can act at a distance. Magnetic and electrostatic forces can act on an object without actually touching it. So, they are non-contact forces. For example, tiny paper pieces can be picked up using a charged comb, iron nails can be attracted to a magnet from a distance. It’s a property of these forces that like charges/poles repel each other while unlike charges/poles attract.


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