ElectrostaticsHard

Question

A particle of mass 2 g and charge 1μC is held at rest on a frictionless horizontal surface at a distance of 1 m from a fixed charge of 1 μC. If the particle is released it will be repelled. The speed of the particle when it is at distance of 10 m from the fixed charge is:

Options

A.100 m/s
B.90 m/s
C.60 m/s
D.45 m/s

Solution

By conservation of machenical energy
          (2 × 10-3) v2 = 9 × 109 × 10-6 × 10-3
or    v2 = 9 × 103 ×     or         v = 90 m/sec

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