A parallel plate capacitor with circular plates has a steady charging current of 5.0 Amps. The wires into and out of the plates attach to the plate centers. If the radius of each plate is 40 mm and there is no dielectric between the plates, what is the magnetic field magnitude at a position that lies between the plates and is 30 mm from the (imaginary) line joining their centers

If a small-diameter open glass tube is partially immersed in a vessel containing mercury, the surface of the mercury inside the tube will be a. lower than the mercury in the vessel, and shaped like the inside of a bowl. b. higher than the mercury in the vessel, and shaped like the inside of a bowl. c. lower than the mercury in the vessel, and shaped like the outside of an umbrella. d. higher than the mercury in the vessel, and shaped like the outside of an umbrella.