7. Dinesh is studying about the insulator materials, now he is considering to have a thin insulating three-quarter circle of radius, R, y is held fixed in the xy-plane with its center at the origin of the coordinate system, as he draws in down here. It carries a negative charge of -3Q uniformly distributed over its length. An electron is released from rest at the origin. R (a) Find the initial acceleration of the electron in terms of the system parameters. Express your answer in unit vector notation. (Gravity may be neglected.) (b) Determine the maximum speed the electron reaches in terms of the system parameters.

7. Dinesh is studying about the insulator materials, now he is considering to have a thin insulating three-quarter circle of radius, R, y is held fixed in the xy-plane with its center at the origin of the coordinate system, as he draws in down here. It carries a negative charge of -3Q uniformly distributed over its length. An electron is released from rest at the origin. R (a) Find the initial acceleration of the electron in terms of the system parameters. Express your answer in unit vector notation. (Gravity may be neglected.) (b) Determine the maximum speed the electron reaches in terms of the system parameters.