A1.0 c charge is found to exert a force with a magnitude of 1.0 n on a 2.0 c charge. the magnitude of the force exerted by the 2.0 c charge on the 1.0 c charge is: (a)0.5 n (b)1.0 n (c)2.0 n (d).need to know their distance

b) 1.0 N

Explanation:

From Newton's third law we expect that:

the force  1.0 C charge exert on the 2.0 C charge and the force that the 2.0 C charge will exert on the 1.0 C charge to be of the same magnitude but opposite directions.

if the 1.0 C charge exerts a force of 1.0 N on charge 2.0 C charge then charge 2.0 C will exert the force of the same magnitude of 1.0 N.