PHYSICS 208 FINAL EXAM QUESTIONS AND ANSWERS
Consider the equation "F=kq/r^2"
What does k represent?
What is k equal to as a constant (include units)
What is k equal to in terms of the permittivity constant e0?
What is e0 equal to (include units)? - CORRECT ANSWER✅✅k is Coulombs constant
k = 8.99*10^9 (N*m^2)/(C^2)
K = 1/(4*pi*e0) where e0 is the permittivity constant e0
e0 = 8.85*10^-12 (C^2)/(N*m^2)
What is the charge of an electron in C? - CORRECT ANSWER✅✅1.6e-19 C
Given the electric field and the area, what equations can you use to find the charge of a parallel plate
capacitor (you do not have d, the distance between the plates)? - CORRECT ANSWER✅✅Using
V=Ed (where E is the electric field magnitude and d is the distance between the plates)
C= E0*A/d (where E0 is the permittivity constant, A is area, and d is distance between the plates)
Q = CV
Then
Q = (E0*A/d)*(Ed) = E0*A*E (the distance cancels out)
TRUE OR FALSE: If Q is the charge, then Q = the number of electrons * the charge of an electron (Q =
n*e) - CORRECT ANSWER✅✅TRUE
An equipotential surface is perpendicular to what at every point? - CORRECT ANSWER✅✅Field lines.
What does dq/dt equal? - CORRECT ANSWER✅✅Current (I) = dq/dt
What are the two equations for power in terms of voltage V and current I - CORRECT ANSWER✅✅P=
(V^2)/R = (I^2)*R
Consider the equation "F=kq/r^2"
What does k represent?
What is k equal to as a constant (include units)
What is k equal to in terms of the permittivity constant e0?
What is e0 equal to (include units)? - CORRECT ANSWER✅✅k is Coulombs constant
k = 8.99*10^9 (N*m^2)/(C^2)
K = 1/(4*pi*e0) where e0 is the permittivity constant e0
e0 = 8.85*10^-12 (C^2)/(N*m^2)
What is the charge of an electron in C? - CORRECT ANSWER✅✅1.6e-19 C
Given the electric field and the area, what equations can you use to find the charge of a parallel plate
capacitor (you do not have d, the distance between the plates)? - CORRECT ANSWER✅✅Using
V=Ed (where E is the electric field magnitude and d is the distance between the plates)
C= E0*A/d (where E0 is the permittivity constant, A is area, and d is distance between the plates)
Q = CV
Then
Q = (E0*A/d)*(Ed) = E0*A*E (the distance cancels out)
TRUE OR FALSE: If Q is the charge, then Q = the number of electrons * the charge of an electron (Q =
n*e) - CORRECT ANSWER✅✅TRUE
An equipotential surface is perpendicular to what at every point? - CORRECT ANSWER✅✅Field lines.
What does dq/dt equal? - CORRECT ANSWER✅✅Current (I) = dq/dt
What are the two equations for power in terms of voltage V and current I - CORRECT ANSWER✅✅P=
(V^2)/R = (I^2)*R
