posted by Anonymous .
Two 10-cm-diameter charged rings face each other, 24.0 cm apart. Both rings are charged to + 50.0 . What is the electric field strength nC
Where? The field strength varies with location. Midway between the rings, on axis, it is zero, because the fields of the two equally charged rings cancel each other there.
Isn't your "nC" supposed to follow the 50.0? Electric field strength in not measured in nC.