Recent content by aifan27

Ok, and "r" is the distance the point is away from the center, not the radius of the circle, right?

Not really - at both points (12 cm and 20 cm) away, the charge from both spheres affect it, so I should total the charges and therefore use for Qenc, correct?

Homework Statement Two charges concentric spheres have radii of 10.0 cm and 15.0 cm. The charge on the inner sphere is 4.00 x 10 ^-8 C, and that on the outer sphere is 2.00 x 10^-8 C. Find the electric field (a) at r = 12.0 cm and (b) at r = 20.0 cm.Homework Equations I know that this is a...