The electroscope is an apparatus used to detect electric charge. The electroscope consists of a plate, a support and a free to rotate needle all made of metal. After rubbing a balloon on your sleeve, the balloon is brought near to the metallic plate of an electroscope. As a result, the needle of the electroscope deflects. The sign of the electric charge on the needle of the electroscope is:
Neutral
Positive
Negative
Cannot tell without knowing the type of metal.

The leaves will diverge further: The positive charge on the leaves has increased further. This occurs when positive charge is produced on the leaves by the charged object. This is quite possible only when the object is positively charged.

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Histrionicus Histrionicus · Answer 2 · 2021-11-29T06:35:22+01:00

The sign of the electric charge on the needle of the electroscope is: Negative

The electroscope is an instrument used to detect the presence of an electric charge on a body. The electroscope consists of a plate, support, and a free to rotate needle all made of metal. It detects charge by the movement of a test object due to the Coulomb electrostatic force on it.

rubbing a balloon on your sleeve is results in pulling electrons which means the balloon would have a negative charge now.
this negative charge of the balloon causes deflection of the needle of the electroscope which means it has a negative charge as well.

Thus, the sign of the electric charge on the needle of the electroscope is: Negative

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