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What causes triboelectric effect?

Important Questions on Electrostatics

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What is the similarity between mass and charge?
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If a body is charged by rubbing it, its weight -
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What is the difference between piezoelectric and triboelectric?
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A conductor has been given a charge -3×10-7 C by transferring electrons. Mass increase (in kg) of the conductor and the number of electrons added to the conductor are, respectively
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Two metallic spheres of same mass are given equal and opposite charges. Then,
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Assertion: When charges are shared between two bodies, there occurs no loss of charge, but there does occur a loss of energy.

Reason: In case of sharing of charges conservation of energy fails.
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The total positive charge in a glass of water containing 180 g of water is approximately:
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When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.
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The electric field that can balance a deuteron of mass 3.2×10-27 kg is
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It is now believed that protons and neutrons (which constitute nuclei of ordinary matter) are themselves built out of more elementary units called quarks. A proton and a neutron consist of three quarks each. Two types of quarks, the so called ‘up’ quark (denoted by u) of charge +(2/3)e, and the ‘down’ quark (denoted by d) of charge (1/3)e, together with electrons build up ordinary matter. (Quarks of other types have also been found which give rise to different unusual varieties of matter.) Suggest a possible quark composition of a proton and neutron.
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What is the triboelectric effect and triboelectric series?
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Two metallic spheres of the same mass are given equal and opposite charges. Then,
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Figure shows tracks of three charged particles in a uniform electrostatic field. Give the signs of the three charges. Which particle has the highest charge to mass ratio?

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When a body is connected to the earth then, electrons from the earth flow into the body. It means before earthing, the body is,