True or false?

(a) When two substances are rubbed on each other, like charges are developed on each.

(b) An atom may have either a positive or a negative charge.

(c) Substances that allow the flow of electricity are called good conductors.

(d) If the leaves of the electroscope spread only a little, the charge on them is greater.

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Solution

(a) False

Description: When two substances are rubbed on each other, equal and opposite charges are developed on each.

(b) False

Description: An atom has an equal number of positive and negative charge particles, so it is neutral. Hence, an atom does not have any net charge.

(c) True

(d) False

Description: If the leaves of the electroscopes spread only a little, the charge on them is greater.

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Similar questions

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.

Fill in the blanks:

(a) Like charges ___ while unlike charges ___.

(b) Mercury is a ___ of electricity while pure water is ___ of electricity.

(d) When an uncharged conductor is brought in contact with the disc of a gold leaf electroscope, it leaves ___.

(e) Charge is shared in charging a conductor by the method of ___.

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