Charges and Charging
An electric field is pointing towards a charged particle. What is the sign of the charge on the particle?
Negative
What kind of force (attractive/repulsive/none) is between two oppositely charged particles?
Attractive. Opposites attract.
Which way do the electric field lines point for a positive charge?
Away from the charge
If you were to sketch the magnetic field lines around a bar magnet, what would it look like?
Point away from the north, loop around and end on the south pole.
Where on a graph would a student find the independent variable?
The bottom or the x-axis.
If you were to sketch a picture for the electric field lines for a positive charge near a negative charge, what would this look like?
Point away from the positive, towards the negative, and bending towards the negative in between the two charges.
Name two ways to decrease the force between two charges.
Decrease charge or increase distance
A negative charge is placed in a an unknown electric field. The charge is observed to move to the left. Which way is the electric field pointing?
Right
If the metal bar in a compass is treated like a bar magnet, which pole of the compass will point towards the south pole of an actual bar magnet?
The "north pole" of the compass will point towards the south pole of the bar magnet.
What is the independent variable?
The variable we adjust in an experiment. It is changed by the experimentor.
An object has more positive charges than negative charges. What must be the overall charge on this object?
Positive
In the balloon and sweater PhET, the balloon was rubbed on the sweater and gained electrons. What happened when this balloon was moved towards the wall?
The electrons repelled. The protons remained in one spot.
Increasing the wraps/loops/coils around the nail in our electromagnet did what to the strength?
Increased the strength
A negatively charged particle is placed at the north pole of a bar magnet. Will the charge be affected by the magnet?
No; electric charge does not affect the strength of a magnet.
What is the dependent variable?
A positively charged bar touches a neutral metal sphere. After the bar is taken away from the metal sphere, what kind of charge (pos, neg, or neutral) will the sphere have?
Positive.
What are the rules of attraction and repulsion for electric forces?
Opposites attract (+ and -). Like repels like (- and -, or + and +).
A student was looking at different electric charges and wanted to determine which had the most strength. What does this student need to look for?
The field lines. More lines = more strength
How do you determine the strength of a magnet?
A motor does what?
Transfers electricity into motion.
A charged particle is placed in an electric field that comes from a positive charge. If the charged particle moves away from the source, what is the sign of the charged particle?
Positive.
What happens when you move away from an electric charge?
A positive charge is placed near an unknown source charge. The positive charge moves away from the source charge. Which direction does the field from the source charge point?
Where will the magnetic field be the strongest around a bar magnet?
Near the poles
What college did Ms. Etienne attend?
Michigan State University.