Fill in the blanks below to the best of your ability. The sizes of the blanks ar

Question

Fill in the blanks below to the best of your ability. The sizes of the blanks are not an indication of the length of the words. Blanks that continue from one line to the next are separate and indicate two blanks. You are moving electron along the trajectory shown below at a constant velocity. Your force is indicated at 4 points (a-d) along the trajectory. (For clarity I have located the electron at each of the position. There is only one electron!) I am moving an electron at a constant velocity so I know that the on the electron must be because it is not.Since the of an electron is very small I can assume that any force on the electron would be immeasurably small. Since the on an object cannot be zero if there is only acting there must be a second. Ruling out gravity, I can assume that there is an acting in the direction to my applied force at all times since the force is. I know that the of an electron is and that the on it must be in the opposite direction of the at each of the four points indicated. The force that I must apply to keep the electron moving at a constant velocity is changing in both and. Again, since the on the electron is I can conclude that the along the trajectory is also changing in and. Draw vectors that represent the direction and relative magnitude of the electric field at each of the 4 points along the trajectory. The electric force on the is never to the trajectory but it always has a component along the of from a to d indicating that the done by the field is. If the by the field is I know that the electron is traveling a location with lower. The at point d is higher than the at point c which is in turn than the at b making the at a. This agrees with my understanding that the electric potential in the of the and that the does not necessarily point in the direction of electric potential energy because electric potential energy also on the of the charge being moved where the is specific only to the spatial location.

Explanation / Answer

I am moving an electron at a constant velocity so I know that the --FORCE-- on the electron must be --ZERO-- because it is not -ACCELERATING---. Since the --MASS-of an electron is very small I can assume that any --GRAVITY-- force on the electron would immeasurably small. Since the -FORCE--- on a object cannot be zero if there is only -ONE FORCE-- acting there must be a second-FORCE--- . Ruling out gravity, I can assume that there is an ---EXTERNAL FORCE---acting in the --DOWNWARD------direction to my applied force at all times since --GRAVITY---force is-CONSTANT-----. I know that the ----CHARGE-----of an electron is --NEGATIVE------and that the -----FORCE------on it must be in the opposite direction of the --ELECTRIC FIELD----------at each of the four points indicated. The force that I must apply to keep the electron moving at a constant velocity is changing in both magnitude and direction. Again since the charge on electron is negative, I can conclude that the net force along the trajectory is also changing in magnitude and direction.

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