A particle with positive charge Q is held fixed at the origen. A second particle with positive charge q is fired at the first paricle, which follows the trajectory as shown in fig.

(a) Is the angular momentum of the second particular momentum of the second particle constant about some axis? Why or why not? Give reason to support your answer.
(b) Does the Coulomb force that one charge exerts on other charges changes if the other charges are brought nearby?(yes/No)

Explanation

(a) Angular momentum of q will be constant about Q, because force acting on q due to Q will pass through Q and this force produces no torque about Q.
(b) No.