1answer a,c
a is obvious ..
coming to c....
E is conserved as K.E of y will be converted to electrostatic potential energy...momentum is in conserved as there will be requirement of external force to keep y fixed
A charged particle x moves towards another charged particle y . For the system of x and y , the total momentum is p and the total energy is E . Then :
(a) p and E are conserved if both x and y are free to move
(b) p and E are conserved only if x and y have similar charges
(c) If y is fixed E is conserved but not p
(d) If y is fixed neither p nor E is conserved
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