Q. Two parallel plates, each with an area of 100 cm^2 , are given charges of equal magnitudes 8.9 X 10^-7 C but opposite signs. The electric field within the dielectric material filling the space between the plates is 1.4 X 10^6 V/m. (a) Calculate the dielectric constant of the material. (b) Determine the magnitude of the charge on each dielectric surface.
Q. For the normal force in the figure to have the same magnitude at all points on the vertical track, the stunt driver must adjust the speed to be different at different points. Suppose, for example, that the track has a radius of 3.5 m and that the driver goes past point 1 at the bottom with a speed of 17 m/s. What speed must she have at point 3, so that the normal force at the top has the same magnitude as it did at the bottom?