Two rings of radius 5 cm are 24 cm apart and concentric with a common horizontal x axis. The ring on the left carries a uniformly distributed charge of +31 nC, and the ring on the right carries a...

Two rings of radius 5 cm are 24 cm apart and concentric with a common horizontal x axis. The ring on the left carries a

uniformly distributed charge of +31 nC, and the ring on the right carries a uniformly distributed charge of −31 nC.

(a) What is the magnitude and direction of the electric field on the x axis, halfway between the two rings?

(b) If a charge of −9 nC were placed midway between the rings, what would be the force exerted on this charge by the

rings?