High School Physics : Electricity
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Example Questions
Example Question #1 : Electricity And Magnetism
Calculate the magnitude of the electric field at a point that is located 
The magnitude of an electric field due to a single point charge is given by the formula:
The variable 
We can now use the given constant, charge, and distance in the equation to solve for the magnetic field strength.
Example Question #1 : Electric Charge
Materials in which the electrons are bound very loosely to the nuclei and can move about freely within the material are referred to as
Semiconductors
Insulators
Superconductors
Conductors
Conductors
Conductors allow the electrons to flow freely along it. That is why metal; is considered a good conductor. It allows the electrons to flow through it which is why it is used in wire in an an electric circuit.
Example Question #2 : Electric Charge
A glass rod is rubbed with a piece of silk. During the process the glass rod acquires a positive charge. The silk
Acquires a positive charge as well
Could either be positively charged or negatively charged. It depends on how hard the rod was rubbed.
Remains neutral
Acquires a negative charge
Acquires a negative charge
Since the glass rod acquires a positive charge, this means that it is deficient in electrons. Since the rod was rubbed by the piece of silk, the silk is what now collects the electrons. The silk now has an excess of electrons which means that the silk is now negatively charged.
Example Question #3 : Electric Charge
A charged rod carrying a negative charge is brought near two spheres that are in contact with each other but insulated from the ground. If the two spheres are then separated, what kind of charge will be on the spheres?
The sphere near the charged rod becomes positive and the other becomes negative
The sphere near the charged rod becomes negative and the other becomes positive
None of these
The spheres do not get any charge
The sphere near the charged rod becomes positive and the other becomes negative
When the negatively charged rod is brought near one of the two spheres, the presents of the negative charge will induce a flow of charge in the spheres such that regions farthest away from the charged rod will become most negative and regions near the rod will become most positive. This is called charge by induction.
Example Question #4 : Electric Charge
By what method will a positively charged rod produce a negative charge on a conducting sphere that is placed on an insulating surface?
Charge by induction
Charge by convection
Charge by conduction
None of these
Charge by induction
Charge by induction happens when a charged object is brought in the vicinity of a neutral object. The presents of the charged object will cause the free charges in the neutral object to shift such that the neutral object becomes polarized. When the charged object is positive, this will induce a negative charge on a neutral object.
Example Question #5 : Electric Charge
How many electrons make up a charge of 
The charge of a single electron is
We can then convert the amount of charge to determine the number of electrons.
Example Question #6 : Electric Charge
A neutral atom always has
More protons than electrons
Possible Answers
The same number of protons and electrons
More neutrons than protons
The same number of neutrons and protons
The same number of protons and electrons
Protons are positively charged and electrons are negatively charged. In order for an object to be considered neutral, it must have the same number of both positive and negative particles. Therefore it must have the same number of both protons and electrons.
Example Question #927 : High School Physics
As an object acquires a positive charge, its mass usually
Increases
Becomes negative
Stays the same
Decreases
Decreases
When an object acquires a positive charge, it is losing electrons to its surroundings. If it is losing electrons, it is losing mass (although ever so slightly).
Example Question #927 : High School Physics
What is the net charge of a 
Since a gold atom has balanced protons and electrons, the net charge on the atom is 
Example Question #928 : High School Physics
A negative point charge is in an electric field created by a positive point charge. Which of the following is true?
The field points away from the positive charge, and the force on the negative charge is in the opposite direction as the field
The field points toward the positive charge and the force on the negative charge is in the same direction as the field
The field points away from the positive charge, and the force on the negative charge is in the same direction as the field
The field points toward the positive charge and the force on the negative charge is in the opposite direction as the field
The field points away from the positive charge, and the force on the negative charge is in the opposite direction as the field
By convention, electric fields point away from positive charges and toward negative charges. Since the field is created by a positive point charge, the electric field will point away from the positive charge.
Negative and positive charges attract one another. Therefore the force on the negative charge is toward the positive charge. This is in the opposite direction as the field.
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