Question1
An isolated large-plate capacitor (not linked to anything) originally has a potential difference of 1110 volts with an air gap of 2 mm. Then a plastic slab 1 mm thick, with dielectric constant 3.5, is inserted into middle of the air gap. Location 1 is at the left plate of the capacitor, location 2 is at left edge of the plastic slab, location 3 is at the right edge of the slab, and location 4 is at the right plate of the capacitor. All of these locations are near to center of the capacitor. Compute following potential differences.
Question2
A pendulum consists of a 320 grams solid ball 15 centimeters in diameter suspended by a basically massless string 80 centimeters long. Compute the period of the pendulum treating it first as an effortless pendulum and then as a physical pendulum. What is error in the simple pendulum approximation?