Physics 2054C – Spring 2002. Review for Quiz on Wed. Start Chapter 17. Housekeeping. Lab Sections. Most People Assigned Let me know if you are in a lab section and need to change. Provide a 1 st and 2 nd choice. CAPA. Need names of those without CAPA logins. Other Questions?.
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F = kQ1Q2 = ma
R2
+
Coulomb’s Law & Newton’s LawR
0.6 m
Sample ProblemL
R
0.6 m
Sample Problem (continued)Case 1 is our only choice.
L
R
Case 1: R negative & L positive
L
R
Case 2: R positive & L negative
Sample Problem (continued)R
0.3 m
Sample Problem (continued)R must be negative since it attracts a positive charge!
L must be positive since it must be opposite to R!
R
0.3 m
Sample Problem (continued)F = Q*ER
ER = FR/Q
= 8.0 N / 5.0 x 106 C
= 1.6 x 106 N/C
R
0.3 m
Sample Problem (continued)ER = kQR/D2
QR = ER * D2 /k
= 1.6 x 106 N/C * (0.3 m)2 /9.0 x 109 Nm2 /C2
QR = 16 x 106 C (16 microcoulombs)
Vab

+
W = qV
W = Fd
W = (qE)d
W = qV = qEd
E = V/d
+q
d
Vab = 1500 V

+
+q = .5 C
d = 2 mm
Electric Potential EnergyW = qV = .5 C * 1500 = 750 J
W = qV = qEd
E = V/d = 1500 V / 0.002 m
= 5.5 x 105 V/m = N/C
Vab

+
W = qV
W = 1.602 x 1019 C * 1 Volt
W = 1.602 x 1019 Joules
W = 1 eV (electron volt)
+q
d