# \[\Phi\]

**Electricity and Magnetism**Level 3

There is a uniformly charged ring having radius \(R\). An infinite line charge (charge [negative] per unit length \(\lambda\)) is placed along a diameter of the ring (in gravity free space). Total charge on the ring \(Q = 4\sqrt { 2 } \lambda R\). An electron of mass \(m\) is released from rest on the axis of the ring at a distance \(x=\sqrt{3} R\) from the centre. Find the initial acceleration of the electron.