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Physics - Electrostatics Question with Solution | TestHub

PhysicsElectrostaticsPotential & potential energyEasy2 minPYQ_2020

PhysicsEasysingle choice

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

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Answer:

Solution:

From conservation of mechanical energy,

$U_{i} + K_{i} = U_{f} + K_{f}$

$\frac{K q_{1} q_{2}}{r_{1}} + 0 = \frac{K q_{1} q_{2}}{r_{2}} + \frac{1}{2} m v^{2}$

$(9 \times 1 0^{9}) \times (1 \times 1 0^{- 3}) (1 \times 1 0^{- 6}) [\frac{1}{1} - \frac{1}{10}] = \frac{1}{2} (2 \times 1 0^{- 3}) v^{2}$

$\sqrt{\frac{9 \times 9}{10} \times \frac{2}{2 \times 1 0^{- 3}}} = v$

$v = 90 m s^{- 1}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:ElectrostaticsSubtopic:Potential & potential energy

⏱ 2mℹ️ Source: PYQ_2020

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