A rod is brought near an uncharged pith ball electroscope. What conclusion would you draw about the charge on the rod if the pith ball does not move ?

rod is Uncharged

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rod is Charged

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Its weight is very light

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Can't say

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Solution

The correct option is A rod is Uncharged
The pith-ball electroscope is used to detect the presence of a static electricity charge. The two lightweight 'pith' balls suspended from the strings are attracted to objects with a static electric charge. The pith balls can also be charged by touching them to an object with a static electric charge.
The pith-ball electroscope is also useful for detecting electric charges and for determining the polarity of an unknown charge.
If we bring a non-charged object near a non-charged pith ball electroscope, the pith ball will not move. But if the object is charged, then the pith ball will move towards or away from the charged body because it is attracted to or repelled from it. The attraction prevails until they touch, then they will repel.
In this case, the pith ball does not move.
Hence, the body is uncharged.

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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.

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