Aparallel-plate capacitor is made of two conducting plates of area a separated by a distance d. the capacitor carries a charge q and is initially connected to a battery that maintains a constant potential difference between the plates. the battery is then disconnected from the plates and the separation between the plates is doubled. the electric potential energy stored in the capacitor will:

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

Is it possible to use the energy from two atoms colliding to create a clean burning lasting fuel source with a large amount of force? is it also possible to harness that energy from the two atoms colliding to create a clean energy source that will last for years from just two atoms colliding. is there a possibility to control and store that energy for years but slowly let the energy out enough to power cities cheaper and faster.

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.