Aparallel-plate capacitor has plate area a. a battery is used to charge the capacitor so that the magnitude of charge on each plate is q, and then is disconnected. initially, the capacitor has a plate separation of d. at this separation the capacitor contains energy u. the plates are then moved to a separation of 2d without disturbing the charge. what is the energy of the capacitor at this larger plate separation?

This chart shows characteristics of three different types of waves. which statement is best supported by the information in the chart? wave x and wave y are mechanical waves, and wave z is an electromagnetic wave. wave x and wave y are electromagnetic waves, and wave z is a mechanical wave. wave x and wave z are electromagnetic waves, and wave y is a mechanical wave. wave x and wave z are mechanical waves, and wave y is an electromagnetic wave.