3/ A positive charge in a region of electric field , if free to move only under

Question

3/ A positive charge in a region of electric field , if free to move only under forcing by the electric field, will tend to move

a- away from infinity.
b- from low potential to high potential.
c- from high potential to low potential.
d- toward infinity.

4/ a negative charge in region of electric field, if free to move only under forcing by the electric field, will tend to move

a- away from infinity.
b- from low potential to high potential.
c- from high potential to low potential.
d- toward infinity.

5/ suppose you have two positive point charges. as you move them farther and farther apart, the potential energy of this system

a- decreases
b- increases.
c- stays the same.

Explanation / Answer

3) C-just like a ball on a hill will naturally roll down moving from higher to lower gravitational potential, charge naturally moves from higher electric potential to lower potential. We do not know whether that direction is toward or away from infinity, because we are not told which way the field is directed, nor where we are defining '0' potential to be. 4) C-for the same reason as 3. 5) Two positive charges will have a repulsive force. The closer they are together, the stronger that force and greater the potential. Therefore, when they are moved apart, their potential will decrease.

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