After a shower of rain, a rainbow is seen -
1) Even in the absence of the sun
2) opposite the sun
3) towards the sun
4) anywhere, irrespective of the position of the sun

Which type of electromagnetic waves make up the colors of a rainbow seen after a storm?

Two large, parallel, conducting plates are 12 cm apart and have charges of equal magnitude and opposite signs on their facing surfaces. An electric force of 3.9×10^{−15}N acts on an electron placed anywhere between the two plates. (Neglect fringing.) (a) Find the electric field at the position of the electron. (b) What is the potential difference between the plates?

Two large, parallel, conducting plates are12 cm apart and havecharges of equal magnitude and opposite sign on their facingsurfaces. An electrostatic force of 3.3 * 10^{-15 N acts on an electron placed anywhere betweenthe two plates. (Neglect fringing.) (a) Find the electric field atthe position of the electron. (b) What is the potential differencebetween the plates?}