solve

21. A thin wire carrying charge +Q is bent into a circle of radius R, and placed in the yz plane, with the centre of the circle at the origin. A proton (mass mp , charge +e) 1s placed at the origin. After the proton is displaced very slightly in the +x direction, it accelerates along the x axis to infinity. a) Find the potential at the origin, due to the charged wire. b) Find the speed of the proton at infinity in terms of Q, R, mp and other physical constants