EASY
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Electrons have negligible mass and charge.

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Important Questions on Electrostatics

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State the principle of conservation and principle of quantization of electric charge.
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An infinite line charge produces an electric field of 1.8×105 N C-1 at a distance of 2 cm. Calculate the linear charge density.
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The attractive force results when a glass rod rubbed with a silk and a plastic rod rubbed with a fur brings together. During friction which type of charges are developed on glass rod and plastic rod? 
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If a body gives out 109 electrons every second, how much time is required to get a total charge of 1 C from it ?
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Which experiment established that the electric charge is quantised?
HARD
You know, if a charge particle q, moving with velocity v→ enters a uniform magnetic field B→, it experiences a force F→=qv×B→. Name the path described by q when the angle between v→and B→ is 1) âˆ Î¸=90° and 2) âˆ Î¸ < 90°
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How many electrons, protons and neutrons are there in 16 g of O816?
MEDIUM
Ten charges are placed on the circumference of a circle of radius R with constant angular separation between successive charges. Alternate charges1,3,5,7,9 have charge (+q) each, while 2,4,6,8,10 have charge (–q) each. The potential V and the electric field E at the centre of the circle are respectively : (Take V=0 at infinity)
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If two electrons are forced to come closer to each other, the potential energy of the system of 2 electrons will
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How many electrons are present in 1(one) Coulomb of electric charge?
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The charge present in a doubly ionized helium atom is
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When a number of charged liquid drops coalesce, which of the following quantity does not change?
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As shown in the figure, two particles, each of mass 'm' tied at the ends of a light string of length 2a are kept on a frictionless horizontal surface. When the mid point (P) of the string is pulled vertically upwards with a small but constant force F, the particles move towards each other on the surface. Magnitude of acceleration of each particle, when the separation between them becomes 2x is

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EASY
Assertion: A body can have charge 3.0 Ã— 10–18 C 

Reason: Charge is quantized.