Savvas Electricity and Magnetism Topic 9

Which state is true about the flow of voltage?

• 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 is similar about magnetic and electric 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.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which of the following lists correctly names and gives an example of each of the four ways that static electricity can be created?

• Friction (rubbing a balloon on hair), Conduction (touching a charged rod to a metal sphere), Induction (bringing a charged object near a neutral one), and Polarization (electrons shifting within an atom)

• Friction (mixing water and oil), Conduction (heating a metal rod), Induction (using a magnet to move electrons), and Polarization (melting ice)

• Friction (freezing water), Conduction (boiling water), Induction (evaporation), and Polarization (condensation)

• Friction (shaking a soda can), Conduction (pouring water), Induction (spinning a wheel), and Polarization (breaking glass)

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.

Roman is using a bar magnet in an experiment to determine how its magnetic field lines look. He accidently drops the magnet, breaking it in two. He picks up both pieces and modifies his experiment to determine what happened to the magnet when he dropped it. Which of the following statements may Roman find to be true during his experiment? Choose the two that apply.

• Both pieces of the magnet have north and south poles.

• There is an attractive magnetic force between the two pieces where they broke.

• Each broken piece of the magnet retains only one pole.

• The broken pieces of the magnet are no longer magnetic.

• Both pieces have a magnetic field that together is stronger than the original.

Tags

NGSS.MS-PS2-5

Credit cards contain a strip on the back made up of many tiny bar magnets. When the bar magnets are arranged in a certain order, they can create a code from the resulting magnetic field. The code contains information like the account number and expiration date of the card. 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.

Vincent is listing the ways that he could increase the magnetic field of the solenoid he made. Which of the following can he add to his list?

• increasing the number of loops

• spacing the loops farther apart

• decreasing the current

• adding an insulating core

• increasing the current

Tags

NGSS.HS-PS2-5

Claire is making a Venn diagram to show the similarities and differences between electricity and magnetism. Use the graphic organizer to help her organize the following phrases into their correct places: Fill in the table with the correct phrases under electricity, magnetism, or both.

Groups:

(a) Electricity

,

(b) Magnetism

,

(c) Both

• opposite charges attract

• charges/poles occur in pairs

• Current made up of a stream of electons

• potential energy decreases as like poles move apart

• creates a field

Based on the image above, how can you determine the direction of the current and what will the resulting magnetic field look like? Select all that apply.

• By using the right-hand rule; the magnetic field will form concentric circles around the wire.

• By using the left-hand rule; the magnetic field will point in the direction of the current.

• By observing the color of the wire; the magnetic field will be straight lines.

• Current will flow from the positive end of the battery towards the negative end

• Magnetic fields will run from North to South with stronger field lines at the poles

Tags

NGSS.MS-PS2-3

What would the magnetic strength be for an electromagnet with 75 coils and a current of 2?

• 7,500

• 75,000

• 15,000

• 150,000

Tags

NGSS.MS-PS2-3