You are provided with a positively charged gold leaf electroscope. State and
explain what happens when
a. a glass rod rubbed with silk is brought near the disc of the electroscope.
b. an ebonite rod rubbed with fur is brought near the disc of the electroscope.
c. an uncharged metal rod is brought near the disc of electroscope
d. a glass rod rubbed with silk is rolled on the disc of the electroscope.

Open in App

Solution

Dear Student,

a) A glass rod rubbed with silk will acquire positive charge, so when it is brought near the disc of electroscope then the leaves will attract each other and hence contract.

b) A ebonite rod under the above circumstances will get negatively charged and hence as per the above observation the leaves with dilate.

c) If the metal rod is electrically neutral then, nothing will happen to the leaves.

d) If the glass rod is rolled on the disc then, it being positively charged, i.e., electron deficient will gain electrons from the disc as per the laws of charging by conduction and hence the disc which will loose certain amount of charge will make the leaves contract.
Regards

Suggest Corrections

Similar questions

A glass rod rubbed with silk is brought near the disc of a negatively charged gold leaf electroscope. The divergence of its leaves will :

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.

Join BYJU'S Learning Program