# Coulomb Force and Electric Field Strength

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Professor
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Physics
1. Calculate the magnitude and direction of the coulomb force on each of the 3 charges below.
Magnitude and direction of a coulomb force
6.00 µC charge; Magnitude= 10.8N
Direction=left
1.5µC charge; magnitude= 99.9N
Direction= right
-2.0 µC charge; magnitude=90N
Direction=Left
2. Three points charges are located on a circular arc.
a) Total electric field at p
Magnitude=2.039*10-7N/C
Direction=left
b) Electric force
Magnitude=1.79*10-9N
Direction=left
3.An electric field of intensity 2.75 kN/c is applied along the x-axis. Calculate the electric flux
a) 6737.5N.m2/C
b)9625N.m2/C
c)15671N.m2/C
4 A point charge q=+36.0 moves from A to B separated by a distance d=0.162m in the presence of an external electric field.
a) Magnitude= 12345.67901N
Direction= right
b) 2000j
c) 10345.67901j
d) 42.57V
5. Consider the following
a) Equivalent capacitance=34.66µF
b) Charge on right 34.60 capacitor=3.84µC
Charge on left 34.60 capacitor=3.84µC
On 28.60µF=3.18 µC
On 6.00µF=0.67µC
c) Potential difference on
The right 34.60 µF capacitor=4.50V
The left 34.60 µF capacitor=4.50V
The 28.60 µF capacitor=7.44V
The 6.00 µF capacitor=1.56V
6.
a) 3.168cents
b) No
22.18181818181818A
The reason is because, wattage is directly proportional to voltage, and the current is higher since the wattage varies but voltage is constant. 7.
a) 4.67V
b)-8.67V
c) 13.33V
d) 300j
8.
a) For 1.75µF capacitor= 5.0*10-7C
For 7.75µF capacitor= 2.21428*10-6C
b) For 1.75µF capacitor= 1.63265*105C
For 7.75µF capacitor=3.686635*104C
9. Two conductors have a net charge of +26.1 and -26.1 respectively and a potential difference of 26.1v
a) Capacitance = *10-6
=1.0*10-6µF
b) Potential difference V=Q/C
=*10-6
=321V
10.
a) 1.77*10-6
b) 7.08*10-6
11. Electric force
Magnitude=6.112*10-17N
Direction= left
b) Acceleration
Magnitude=3.65988024*1010m/s2
Direction= right
c) Distance travelled in 1.98µs=0.07174m

12. Determine the electric field strength at a point 1.00cm to the left of the middle charge shown in the figure below (enter magnitude)
Magnitude=90N
Direction= left