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Electrons have negligible mass and charge.

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Important Questions on Electrostatics
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Mention one difference between mass and charge.

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HARD

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MEDIUM

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As shown in the figure, two particles, each of mass tied at the ends of a light string of length are kept on a frictionless horizontal surface. When the mid point of the string is pulled vertically upwards with a small but constant force the particles move towards each other on the surface. Magnitude of acceleration of each particle, when the separation between them becomes is

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Reason: Charge is quantized.
