Four charges are placed at the corners of a square, where q is positive (q > 0). initially there is no charge in the center of the square.

a) find the work w required to bring the charge qf = +q from infinity and place it at the center of the square.

b) what is the magnitude of the electric force on the charge q when it is placed at the center of the square?

c) what is the magnitude of the total electrostatic energy of the system?

d) what is the sign of the total energy associated with the five point charges?

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

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