An air-filled parallel-plate capacitor has round plates and carriesa fixed amount of equal but opposite charge on its plates. All thegeometric parameters of the capacitor (plate diameter and plateseparation) are now doubled.
if the original energy density between theplates was u0, the new energy density is:

a. 16u0
b. u0/4
c. u0
d. u0/16
e. 4u0

Three charge are arranged as shown in the diagram. the magnitude of the net electrical force acting on the +6 uc charge, rounded to the tenths place, is .

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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.