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A charged particle X moves directly towa...

A charged particle X moves directly towards another charged particle Y. For the X plus Y system, the total momentum is p and the total energy is E.

A

If Y is fixed, E is conserved but not p.

B

If Y is fixed, neither E nor p is conserved.

C

p and E are conserved if both X and Y are free to move.

D

(a) is true anly if X and Y have similar charges.

Text Solution

Verified by Experts

The correct Answer is:
A, C
a.,c.
If the system is isolated (no external forces) `P` and `E` are conserved. Electrostaic forces are internal forces. So (a) is correct. To fix `Y` external forces must act on the system i.e., on `Y`. In that case `p` is not conserved. However these external force do not work as there is no displacement of `Y.E` is conserved. So (c) is correct.
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