The leaves of the electroscope, when a negatively charged object is brought near the knob of a negatively charged electroscope, will move farther apart.
What is charging by friction?
When the two materials are rubbed each other, then the electric charged generated between them.
This charging of materials due to the rubbing or two materials against each other, is called the charging by friction.
Electroscope is the device which is used to sense the presence of the electric charge on a body.
It is a simple device consisting of a metal ball that is attached by a conductor to two thin leaves of metal foil protected from air disturbance in a jar.
This force of attraction or repulsion is identified by the sign of the particular charge. According to the property of interacting charges-
- Like charges-For the like charges, when two same charges (positive-positive or negative-negative) interact to each other, then the charges repel each other.
- Unlike charges-For the unlike charges, when two charges interact to each other, then the charges attract each other.
Here, in the problem, the negatively charged object is brought near the knob of a negatively charged electroscope. Thus, due to like charges, they body repel each other, and move away.
Hence, the leaves of the electroscope, when a negatively charged object is brought near the knob of a negatively charged electroscope, will move farther apart.
Learn more about the charging by friction here;
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