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Electric Potential
Electric Fields
Grab Bag
Capacitors
Circuits
100
What are volts equivalent to?

J/C

100

A closed surface, in the shape of a cylinder of radius R and length L, is placed in a region with a constant electric field of magnitude E. What is the total electric flux through the cylindrical surface?

0 Webers
100

The average human body contains how many pints of blood?

10 pints
100

A capacitor of 0.75 µF is charged to a voltage of 16 V. What is the magnitude of the charge on each plate of the capacitor?

1.2 x 10-5 C

100
If you made a graph of Voltage vs. Current, what would the slope be?
resistance
200

A charge of magnitude -3.0 x 10-6 C is moved through a potential difference of 80 volts. What is the work done on the charge?

2.4 x 10-4 J

200

What is the electric field due to an infinite plane of charge, at a distance r away?

E = σ/2ε0

200

At what temperature are Celsius and Fahrenheit equal?

-40 degrees
200

A parallel-plate capacitor is charged by a battery and then disconnected. What will happen to the charge on the capacitor and voltage across it if the separation between the plates is decreased and the area is increased?

the charge remains the same and voltage decreases

200
Sketch the schematic diagram for a circuit that contains a battery, a light bulb, an ammeter, and a voltmeter that is measuring the potential difference across the light bulb.
ammeter in series, voltmeter in parallel with light bulb, battery and light bulb symbols correct
300

A charge of +4.0 C is moved a distance of 0.50 m in a uniform electric field of magnitude 30 N/C. What is the work done on this charge by the electric field?

60 J
300

A conducting sphere of radius R carries a charge Q. Another conducting sphere has a radius R/2, and the same charge. What is the ratio of the electric field near the surface of the smaller sphere to the field near the surface of the larger sphere?

4
300
Which planet has the most moons?
Jupiter, with over 60 moons
300

Three capacitors are connected in parallel with a capacitance of 5 µF each. What is the total capacitance of the circuit?

15 µF

300

In a series circuit with a current of 2 A, there are two resistors with resistances of 3 Ω and 4 Ω, respectively. What is the voltage of the battery?

14 V
400

Draw the equipotential lines and electric field lines in a uniform electric field, with a negative line of charge on the top, and a positive line of charge on the bottom.

electric field lines pointing from bottom to top, equipotential lines parallel to lines of charge, perpendicular to E field lines
400

An electron is traveling at 2.0E6 m/s in a 500 N/C electric field. How long will it take for the electron to stop?

2.3E-8 s

400
What is the fear of being left-handed or having objects to the left side of the body called?
sinistrophobia
400

A camera flash unit stores energy in a 150 µF capacitor at 200 V. How much electric energy can be stored?

3 J
400
Sketch a graph of Current vs. Time in a regular RC circuit, while the capacitor is charging. Label the y-intercept.

y-intercept = ε/R, decreasing approaching zero

500

A proton (mass m, charge +e) and an alpha particle (mass 4m, charge +2e) approach one another with the same initial speed v from an initially large distance. At what distance r will these two particles be separated by right before turning around?

r = 4ke2/5mv2

500

A sphere of radius R has positive charge Q uniformly distributed throughout its volume. Sketch or describe the graph of the electric field as r goes from 0 to R, and when r>R.

r<R: linear, positive slope

r>R: rational function, approaching zero

500
What is a group of porcupines called?
a prickle!!!
500

Rank the following on order of greatest increase of capacitance if the material were to be used as a dielectric: water, air, glass.

water, glass, air
500

The time constant is the time that it takes for the capacitor to reach ___% of the emf value during charging.

63 %