Static Electricity
What is conduction?
Charging a neutral objected by touching it with a charged object
Give 1 rule about electric field lines
positive to negative, don't cross, even spacing etc.
What is the direction of the force between 2 positive charges?
repelling
What is Ohms law?
Relationship between voltage, current, and resistance
What is induction?
Bringing a charged object close to a neutral object to charge it
Draw the electric field lines between 2 positive charges
photo
A –2.0 μC charge feels a force of 0.12 N in a uniform electric field.
What is the magnitude of the electric field?
-6 x10^4 N/C
A 9-V battery produces a current of 0.75 A in a circuit.
What is the circuit’s total resistance?
12 ohms
What is an electroscope?
Tells us if an object is charged. The leaves separate when it is charged
Draw the electric field lines between 2 positives and a negative in a triangle
photo
A small charge (q = .006 C) is found in a uniform E-field (E = 2.9 N/C). Determine the force on the charge.
0.02 N
A 3 Ω resistor carries a 2 A current.
What is the voltage across it?
6 V
Give an example of static electricity being dangerous.
Sparks at gas pumps
Find the electric field E at a point 0.10 m from a +3.0 μC charge.
E=2.7 x10^6 N/C
A positive charge is placed in an electric potential difference of 25 V at a distance of .02 m. What is the electric field?
1250 V/m
A 12 Volt car battery pushes charge through the headlight circuit resistance of 10 ohms. How much current is passing through the circuit?
1.2 A
Describe how you could demonstrate static electricity with a balloon and small pieces of paper.
Rub the balloon on a shirt (static friction) and then hold it close to the pieces of paper. It will attract the paper.
What is the magnitude of a point charge whose E-field at a distance of 25 cm is 3.4 N/C?
2.4x10-11C
Two charges, q₁ = +3.0 μC and q₂ = +2.0 μC, are separated by 0.15 m.
Calculate the magnitude of the electric force between them. Attractive or Repulsive?
2.4 N Repulse
How much voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms of resistance?
50 V