A long Solenoid has diameter of 12.0 cm. When a current exists in the windings a uniform magnetic field B = 30.0 mT is produced in its interior. By decreasing current the field is caused to decrease at a rate 6.5 mT/s. Calculate the magnitude of induces electric field at (a) r = 2.0 cm and (b) r = 8.0 cm from the axis of the Solenoid.