ELECTROSTATICS, COULOMB'S LAW, ELECTRIC FIELD
1C is equivalent to ____ protons/electrons
6.25 x 10^18 protons/electrons
Lines of force start from _______ charge particles and end on a _______ charged particles or continue toward infinity.
positively; negatively
It states that every charge in space creates an electric field at point independent of the presence of other charges in that medium. The resultant electric field is a vector sum of the electric field due to individual charges.”
Principle of Superposition
What is a capacitor?
A circuit element that is primarily used for storing charges.
It is the amount of charge passing through any point in a conductor per unit of time.
Electric Current
What does the LAW OF CHARGES state?
“Like charge repel and unlike charge attracts”
It is the product of the magnitude of the electric field and the surface area perpendicular (normal) to the field.
Electric Flux
A test charge is equal to ____.
+1 C
An insulator which is placed between 2 plates of capacitor.
DIELECTRIC
It is the flow of positive charges from the positive terminal to the negative terminal of a source of voltage.
Conventional Current
It is a charging process that requires physical contact between a charging body and a neutral body. The sign of the charge acquired by the neutral body is the same with that of the charged body. A neutral body becomes positively charged when charged by a positively charged body.
Charging by conduction
If E is perpendicular to A, what is the angle of orientation?
90 degrees
FIND THE EFFECT OF ELECTRIC FIELD OF B, C, D on charge A.
Fb on A: -1, 0
Fc on A: 0,-1
Fd on A: +cos, -sin
What happens to the capacitance if the plate separation of a parallel-plate capacitor is increased by eight times?
THE CAPACITANCE WILL BE DECREASED BY EIGHT TIMES.
If the voltage across a fixed-value resistor is reduced into half, does the current increase or decrease, and by how much?
The current is also reduced into half (direct proportionality of I and V)
Plastic rods were rubbed on a fur. What will happen to the charges of each object after rubbing?
Plastic Rod - negatively charged (-)
Fur - positively charged (+)
If Electric field is parallel to Area, the angle between E and A is θ = 90°. What is the electric flux?
0 Nm^2/C
Find the electric potential produced by a point charge of 7.90 x 〖10〗^(-6) C at a distance of 2.50m.
28,440 V
What is the capacitance of series capacitors connected in a circuit?
C1 = 2 F,
C2 = 3 F, and
C3 = 5 F
C = 1.03 Farads
If the resistance in a circuit is 1.75 Ω and the voltage to 220 V, what is the value of current?
125.71 Amperes
Suppose that two equally charged spheres attract each other with a force of -0.492 N ("-" means attractive) when placed a distance of 29.1 m from each other. Determine the charge of the spheres. Assume that constant g is equal to 6.67 × 10^-11 m3/kg s-2
-6.25 x 10^12 C
In Gauss Law, “The electric flux Φ through any closed surface (Gaussian surface) is equal to the total sum of charges enclosed by the surface.” What is the electric flux in an enclosed surface with charges +2 C, +3 C, -4 C. Assume permittivity of space is equal to 8.85 x 10^-12 C^2/Nm^2
1.13 x 10^11 C/Nm^2 or 1.13 x 10^11 Nm^2 /C
Two point charges are arranged on the x-y coordinate system as follows: q1 = 4.0 x 10-9 C at (0, 3 m) and q2 = -10.0 x 10-9 C at (4.5, 0 m). Find the electric field at origin (0,0). Assume that the k = 9.0 x 10^9 Nm^2/C^2
E1 = 4 N/C
E2 = -4.44 N/C
Using Pythagorean theorem:
E = sqrt E1^2+ E2^2
E = 5.98 N/C
What is the capacitance of the capacitors connected in a parallel circuit?
C1 = 5 uF,
C2 = 10 uF, and
C3 = 15 uF
C= 30 uF or 3 x 10^-5 F
Determine the resistance of resistor with color bands of:
Yellow, Green, Red, Red, No color
45, 200 Ω, +/- 20%
or
4.52 x 10^4 Ω, +/- 20%