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Assertion A: ...

Question

Assertion (A): An electroscope can be used to find the presence of charge on a body.
Reason (R): Like charges repel each other.

A

Both A and R are true and R is the correct explanation of A.

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B

A is true but R is false.

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C

A is false but R is true.

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D

Both A and R are true but R is not the correct explanation of A.

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Solution

The correct option is A Both A and R are true and R is the correct explanation of A.
An electroscope can be used to find the presence of charge on a body.
When a charged object is touched by the metal disk, the charges are transferred to the metal strips of the electroscope. Both the strips gain similar charges and start repelling each other. This is because like charges repel.
Uncharged bodies do not change the position of the metal strip.
Therefore, both A and R are true and R is the correct explanation of A.

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Similar questions

Q. Indicate, giving reasons, if the following statements are true or false.
(a) An object which is positively charged contains only protons and no electrons.
(b) An atom with 11 electrons, 11 protons and 12 neutrons is electrically neutral.
(c) An object that is electrically neutral will contain only neutrons.
(d) Two straws rubbed with silk will attract each other.
(e) A balloon rubbed with wool will repel another one that is not rubbed.
(f) When a glass rod is rubbed with silk and made to touch an electroscope, its leaves diverge as they acquire similar charges from the rod.
(g) An electroscope charged by induction develops the same kind of charge as that of the charging body.
(h) To charge an electroscope by conduction, it must be touched by a charged body.
(i) Like charges attract each other while unlike charges repel each other.

Q. Like charges
(a) always repel each other.
(b) always attract each other.
(c) can repel or attract each other depending on conditions.
(d) can repel or attract each other depending on the quantity of charge.

Q. You are given an uncharged electroscope and a charged body. No other apparatus is allowed. You can use the electroscope to
(a) only detect the charge.
(b) detect and measure the charge.
(c) detect, measure and find the nature of the charge.
(d) neither of these since the electroscope is uncharged.

Q. Assertion (A): An electroscope can be used to find the presence of charge on a body.
Reason (R): It is based on the principle: Like charges repel each other.

Describe a simple experiment using a pith ball electroscope to demonstrate that like charges repel and unlike charges attract each other.

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