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
Sketch the magnetic field lines around a bar magnet.
Point away from the north, loop around and end on the south pole.
Two charges are 9.06 m apart. One charge is -1.74 C and the other is +0.98 C. Calculate the electrostatic force between the two charges.
-1.87 x 108 N
Sketch a picture for the electric field lines for a positive charge near a negative charge.
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.
In general, why is the electrostatic force stronger than the force of gravity?
The constant k is much larger than the constant G.
An unknown charge is placed in an electric field pointing directly to the right. If the charge moves to the right, what is the sign of the charge?
Positive; it is moving in the same direction as the electric field.
The force between two charges is measured to be 4.26 N. The two charges are 18.79 m apart and one charge is -5.3 x 10-4 C. What is the value of the other charge?
-3.153 x 10-4 C
Calculate the electric field 15.38 m away from a -0.027 C source charge.
1.027 x 106 N/C
A negatively charged particle is placed at the north pole of a bar magnet. Will the charge be affected by the magnet?
No; the charge is not moving.
What does charging by induction do to the charges in a neutral metal sphere?
Charging by induction separates the charges in a neutral metal sphere, so one side or sphere ends up positive and the other becomes negative.
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.
A negative charge is placed in an electric field pointing to the right. Which direction will the force acting on the charge be pointing?
Left
A charge is placed in an electric field that has a strength of 6.19 N/C. If the charge experiences a force of 12.38 N, what is the value of the charge?
2 C
What are the units for magnetic field strength?
Tesla (T)
A -0.014 C charge is placed in an electric field 27.96 m away from a positive charge. The electric field strength from the positive charge is 5.39 N/C. What is the force that the negative charge experiences?
0.075 N
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.
Which value in the FE equation would you double to increase the force between two charges?
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
Two negatively charged particles are placed near the north pole of a bar magnet. The charges are initially at rest, but are free to move. Will they be affected by the magnetic field from the bar magnet
Yes