please answer the question below

The figure shows a plastic ring of radius R = 50.0 cm. Two small charged beads are on the ring: Bead 1 of charge +2.13 JC is fixed in place at the left side; bead 2 of charge +6.04 JC can be moved along the ring. The two beads produce a net electric field of magnitude E at the center of the ring. At what (a) positive and (b) negative value of angle - should bead 2 be positioned such that E = 2.19 x 10 N/C? (a) Number Units (b) Number Units