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Standard XII

Physics

Energy of a Capacitor

A particle of...

Question

A particle of mass $2 g$ and charge $1 μ C$ is held at a distance of $1 m$ from a fixed charge of $1 m C .$ If the particle of released it will be repelled. Speed of the particle when it is at a distance of $10 m$ from the fixed charge is

100 m / s

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90 m / s

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60 m / s

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45 m / s

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Solution

The correct option is B $90 m / s$
energy of the whole system will be conserved .

so the change in the potential energy of the system will be converted into the kinetic energy of the particle

$K (q_{1} * q_{2}) / (1 / r_{1} - 1 / r_{2})$ $=$ $(m * v^{2}) / 2$

substituting the values will give

$V = 90$ $m / s$

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A particle of mass 2 g and charge 1 μC is held at a distance of 1 m from a fixed charge of 1 mC. If the particle of released it will be repelled. Speed of the particle when it is at a distance of 10 m from the fixed charge is

The correct option is B 90 m/senergy of the whole system will be conserved .so the change in the potential energy of the system will be converted into the kinetic energy of the particle K(q1∗q2)/(1/r1−1/r2) = (m∗v2)/2substituting the values will give V=90 m/s

A particle of mass $2 g$ and charge $1 μ C$ is held at a distance of $1 m$ from a fixed charge of $1 m C .$ If the particle of released it will be repelled. Speed of the particle when it is at a distance of $10 m$ from the fixed charge is