Coulombs Law
Two point charges, q1 = 5 μC and q2 = 10 μC, are separated by a distance of 2 m. Calculate the electrostatic force between them. Remember k = 8.99 x 109 N x m2/C2
What is 112.38 N?
If a 2 C charge is placed in an electric field and experiences a force of 10 N, what is the electric field's strength?
5 N/C
A capacitor stores a charge of 12 C and has a voltage of 6 V. what is the capacitance of the capacitor?
2 F
A capacitor has a capacitance of 10 F and is charged to a voltage of 5 V. How much energy is stored in the capacitor?
125 J
Two-point charges are placed in a vacuum. charge q1 = 2 mC Located 10 m away from charge q2 = -3.5 mC. What is the strength of q1’s electric field that the q2 experiences?
314,650 N/C
Charge q1 = 2 μC and is located at 0.2 m away from Q2. q2 = 2 μC. What is the force between them?
0.899 N or 0.9 N
If a 5 C charge is placed inside an electric field and experiences a force of 15 N what is the strength of the electric field?
3 N/C
A capacitor has a charge of 18 C and is connected to a voltage of 5 V. what is the capacitance?
3.6 F
A capacitor with a capacitance of 20 F is charged to a voltage of 12 V. How much energy is stored in the capacitor?
1440 J
How much energy can a capacitor hold if it is charged to a voltage of 6V and has a charge of 60 mC?
0.18 J
A charge of q1 = -3 nC s 1 m away from charge q2. What is the charge of q2 if the magnitude of the force acting on the two charges is 161.82 N?
6 C
If a 3 μC charge is placed inside an electric field and experiences a force of 12 N, what is the strength of the electric field?
4 x 106 N/C or 4 MN/C
If a capacitor has a charge of 30 μC and the voltage across it is 10 V what is the capacitance of the capacitor?
3 x 10-6 F or 3 μF
If a capacitor has a capacitance of 15 μF and is charged to a voltage of 8 V, how much energy is stored in the capacitor?
0.00048 J or 0.48 mJ
A capacitor is charged across 5V and holds 2.5 J of energy. What is the charge of the capacitor?
1 C
If q1 = 4 mC and q2 equals -8 μC, how far apart are they if the force between them equals 31.96 N?
If an electric field has a strength of 6 x 106 N/C, how much force should a 2 C charge experience if placed in that field experience?
12 N
A capacitor has a capacitance of 5 μF and is connected to a voltage of 12 V. What is the charge stored in the capacitor?
60 x 10-6 C or 60 μC
A capacitor stores 0.5 J of energy when charged to a voltage of 10 V, what is the capacitance?
0.01 F or 10 mF
Two-point charges are placed in a vacuum. charge q1 = 5 mC Located 0.5 m away from charge q2 = -3 μC. What is the strength of q1’s electric field that q2 experiences?
107,880 N/C
What is the magnitude of two charges if they are separated by a distance of 2 m and have a force of 89.9 N between them? Assume the charges are equal.
0.2 mC, 2 x 10-4 C, 0.0002 C
If an electric field has a strength of 4 x 106 N/C and a charge placed in that field experiences a force of 16 N, what is the magnitude of that charge?
4 μC or 4 x10-6 C
A capacitor has a capacitance of 8 microFarads and stores a charge of 32 microCoulombs. What is the voltage across the capacitor?
4 V
A capacitor with a capacitance of 25 μF stores 0.08 J of energy. What is the voltage across the capacitor?
80 V
Explain whether the q1 or q2 from Coulomb's law could be used to find the Capacitance of a capacitor (C = Q/V)
You could not since q1 & q2 are point charges i.e. small particles like electrons, while Q is the total charge stored in an entire plate (which is made up of millions of point charges)