In the right figure, the top panel of graph shows the potential V as a function
ID: 1424791 • Letter: I
Question
In the right figure, the top panel of graph shows the potential V as a function of position x in three regions I, II, and III. Accordingly, four parallel plates, A through D, can be setup to realized the distribution of potential, as schematically drawn in the bottom panel of the figure. The unit of the distance is cm, and the unit of potential is V.
The potential on plate B is ______V?
The magnitude (i.e. absolute value) of the electric field in region I is _________V/m?
A particle carries ?4e charge (i.e. q = -6.4×10-19 C) and is free to move in region III. Its initial velocity is zero at position x = 8 cm. When it leaves region III, how much is the kinetic energy of this particle in eV (electron-volt)? ________eV
Explanation / Answer
Potential on plate B is = 10 V
E = V/d
E = (10 - (-5) / (2/100) V/m
E = 750 V/m
Kinetic Energy Gained by the Particle = q*V
K.E = 4*e * (10 - (-10))
K.E = 80 *eV