WorksheetsChapter 9 Electricity and Magnetism
Total questions: 21
Worksheet time: 12mins
How does the magnetic field protect life on Earth?
The magnetic field directs charged particles toward the poles and then past Earth.
The magnetic field directs charged particles toward the equator and then past Earth.
The magnetic field absorbs the charged particles coming from the sun.
The magnetic field directs charged particles toward the poles then absorbs them.
Which of the following statements should be added about the similarities between the electric and magnetic fields?
The field lines in both magnetic and electric fields are always straight.
Each charged particle and magnet have both a positive and negative side.
Opposite charges and poles are always attracted to each other.
The potential energy increases as like charges or poles get farther apart.
Which statement describes what is happening to cause current to flow?
Voltage is when current flows from lower to higher potential energy.
Voltage is when current flows from higher to lower potential energy.
Amperes is when current flows from lower to higher potential energy.
Amperes is when current flows from higher to lower potential energy.
What can occur by conduction, friction, induction, or polarization?
magnetism
electricity
radiation
static electricity
What occurs when a charged piece of metal comes in contact with a neutral piece of metal?
conduction
polarization
convection
friction
Rubbing a balloon against your hair is an example of ___
conduction
convection
friction
polarization
What occurs when your negatively charged finger gets near, but does not touch, a neutral doorknob. The charge in the doorknob separates so that the side closest to your finger is positive and the side farthest away is negative.
Induction
convection
Polarization
Friction
A negatively charged broom sweeping up paper scraps. The electrons in the paper move to the side of the atoms farthest away from the broom is a form of ___
conduction
polarization
friction
induction
Earth's magnetic field is the strongest at the _______ and ________ poles.
(a)
The south magnetic pole lines up with the _______.
geographic north pole
equator
geographic south pole
santa's workshop
Both pieces of a broken magnet have north and south poles.
true
false
Both pieces of a broken magnet have a magnetic field that together is stronger than the original.
true
false
There is an attractive magnetic force between the two pieces where a magnet has broken.
true
false
What can happen when the credit card accidentally comes into contact with a strong magnet?
The magnetic field on the card is created by permanent magnets that cannot be changed by another magnet.
The magnetic field on the card can be amplified so that the card can be read from farther away.
The magnetic field on the card can be altered so that it will contain a different account number.
The magnetic field on the card can be disrupted, causing it to be demagnetized or unreadable.
How could you increase the magnetic field of a solenoid?
increasing the number of loops
spacing the loops farther apart
decreasing the current
adding an insulating core
What is true about electricity?
a current made up of a stream of electrons
charges/poles always occur in pairs
potential energy decreases as like poles move apart
opposites attract
creates a field
What is true about magnetism?
a current made up of a stream of electrons
charges/poles always occur in pairs
potential energy decreases as like poles move apart
opposites attract
creates a field
An electric current moves from __________ to _________ because the higher potential energy is at the positive end.
(a)
When magnetic field lines point to the left, a wire moves which way due to the interaction with the magnetic field.
to the left
to the right
up
down
Electromagnetic induction is the process in which electricity is produced by a magnetic field. Which of the following statements are false about electromagnetic induction?
Current in the wire causes a magnetic field to form around the wire.
Mechanical energy becomes electrical energy.
A magnetic field induces a current in a wire.
A motor uses the principle of electromagnetic induction to create electricity.
A coil of wire moving over a magnet will create a current.
Larry uses a transformer to step down an incoming voltage. The transformer has ten loops in the primary coil and six in the secondary. If the incoming voltage is 120 volts, what is the outgoing voltage?
720
72
200
20
