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2. Electric Potential and Capacitance
hard
Two positively charged particles $X$ and $Y$ are initially far away from each other and at rest. $X$ begins to move towards $Y$ with some initial velocity. The total momentum and energy of the system are $p$ and $E$.
A
If $Y$ is fixed, both $p$ and $E$ are conserved.
B
If $Y$ is fixed, $E$ is conserved, but not $p$.
C
If both are free to move, $p$ is conserved but not $E$.
D
If both are free, $E$ is conserved, but not $p$.
Solution
We know that electrostatic force is conservative. So the mechanical energy remains conserve when the external force is acting. Therefore, momentum is not conserve.
So $(B)$ is the right option.
Standard 12
Physics
