Q1. Why do you think charging by rubbing happens best in dry weather?
Q2. Is an ebonite rod a conductor or insulator of charge?

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Solution

Ebonite is a poor conductor or it may be called as an inductor

Charging by rubbing happens in dry weather because dry air contains less amount of moisture. Though air is an insulator, sometimes the moisture presents in it conducts these charges.[conductivity of air is reduced by the dryness in air and due to absence of excess moisture makes it less likely for the objects to shed their excess charge in air].

Thus making the object retain its charge and make the charging of objects faster and easier.

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Q. An ebonite rod held in hand can be charged by rubbing with flannel but a copper rod cannot be charged like this. Why?

Match the following:

Column A Column B

(a) Two like charges (i) negative charge

(b) Two unlike charges (ii) repel

(d) Silk is an (iv) attract

(e) Ebonite rod rubbed with fur acquires (v) conductor

Why does an ebonite rod get charged when rubbed with flannel

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.

You are provided with a negatively charged gold leaf electroscope. What happens when an ebonite rod rubbed with fur is brought near the disc of the electroscope?

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Q1. Why do you think charging by rubbing happens best in dry weather? Q2. Is an ebonite rod a conductor or insulator of charge?

Q1. Why do you think charging by rubbing happens best in dry weather?
Q2. Is an ebonite rod a conductor or insulator of charge?