What happens when a charged non-conductor is placed near an uncharged conductor body? Explain They repel...

What happens when a charged non-conductor is placed near an uncharged conductor body? Explain

They repel each other.

They attract each other.

They may attract or repel each other, depending on whether the charge on the insulator is positive or negative.

They exert no electrostatic force on each other.

The charged insulator always spontaneously discharges

Expert Solution

Correct Option: b. They attract each other

Case 1: Positively charged non-conductor

A conductor has free electrons, which can move freely throughout the conductor. Suppose a positively charged non-conductor is brought near the conductor. The free electrons inside the conductor which are negatively charged are attracted towards the positively charged body. Since these electrons cannot leave the conductor they gather at the surface closest to the charged body. The other side is now electron deficit, becoming positively charged. Since negative charge is near to the positively charged non-conductor, it attracts the charged non-conductor. Therefore, the two body attract each other.

Case 2: Negatively charged non-conductor

If a negatively charged non-conductor is brought near the conductor. The free electrons inside the conductor which are also negatively charged are repelled away from the negatively charged body. Since these electrons cannot leave the conductor they gather at the surface farthest from the charged body. The other side is now electron deficit, becoming positively charged. Since positive charge is near to the negatively charged non-conductor, it attracts the charged non-conductor. Therefore, the two body attract each other.

So, in either case the two bodies attract each other. The reason is charge induction.

genius_generous answered 2 years ago

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