Identify the name of the device that can be used to test whether an object is carrying a charge or not. When a charged body is brought near the object the two thin leaves attached to the rod move away from each other indicating a presence of charge.

Electrolarynx

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Electroscope

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Electrode

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Electric motor

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Solution

The correct option is B
Electroscope

A device that can be used to test whether an object is carrying a charge or not is known as electroscope.

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Identify the name of the device that can be used to test whether an object is carrying a charge or not.

Q. A student touches an electroscope with a negatively charged rod, and the leaves of the electroscope separate. What will be the result when a second positively charged rod is brought near, but kept close to the electroscope without touching ?

Write true or false for each statement:

(a) The number of electrons and protons in an atom are same.

(b) If the charge is not in motion, we call it static electricity.

(d) When an ebonite rod is rubbed with fur, the electrons move from ebonite to fur.

(e) When a glass rod is rubbed with the dry silk cloth, the electrons move from glass to silk.

(f) The cap of gold leaf electroscope is made of copper.

(g) If a glass rod rubbed with silk is brought near the cap of a negatively charged electroscope, the divergence of leaves will decrease.

(h) In induction, a positively charged body can make an uncharged body positively charged.

(i) A lighting conductor saves the building from lighting.

(j) When a comb is rubbed with dry hair both comb and paper get similarly charged.

(k) A glass rod rubbed with silk repels an ebonite rod rubbed with fur.

(l) When an ebonite rod is rubbed with fur, the protons move from the ebonite rod to the fur.

(m) A conductor has a large number of free electrons.

(n) An ebonite rod can be charged by touching it with a charged copper rod.

(o) To find whether a body is charged or not, an uncharged electroscope is used.

(p) To find whether the charge on a body is positive or negative, an uncharged electroscope is used.

(q) If a negatively charged rod is brought near a negatively charged pith ball electroscope, the pith ball will be stuck with the rod.

Assertion(A): An electroscope can be used to find the nature of charge on a body.
Reason(R): It is based on the principle: electric charge can be transferred from a charged object to another body.

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.

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Identify the name of the device that can be used to test whether an object is carrying a charge or not. When a charged body is brought near the object the two thin leaves attached to the rod move away from each other indicating a presence of charge.

The correct option is B Electroscope A device that can be used to test whether an object is carrying a charge or not is known as electroscope.

The correct option is B
Electroscope

A device that can be used to test whether an object is carrying a charge or not is known as electroscope.