Circuits, electricity, and magnetism

The electric force between two or more charged objects depends on which of the following quantities?

• charge and distance between the charged objects

• mass and distance between the charged objects

• charge and mass of charged objects

• quantity of charges and their masses

Tags

NGSS.HS-PS2-4

In which of the following circuits will all of the remaining light bulbs go out if bulb 3 burns out?

• 
• 
• 
• 

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NGSS.HS-ETS1-3

Dissolving salt in water increases the conductivity of the solution because the —

• salt gives the solution a net negative charge

• salt ions bond with the available water molecules

• solution has an increase in kinetic energy

• concentration of ions in the solution increases

Tags

NGSS.HS-PS1-5

Which object does NOT conduct electricity?

• copper wire

• iron nail

• salt water

• wood

Tags

NGSS.HS-PS1-3

NGSS.HS-PS2-6

Irene bought a new house and has decided to rewire it. She wants to be able to turn

some lights off and have the others remain lit. What type of circuits should she use and

why?

• She should use parallel circuits because when one light turns off, the other lights remain lit.

• She should use series circuits because when one light turns off, the other lights remain lit.

• She should use parallel circuits because when one light turns off, the others turn off, too.

• She should use series circuits because when one light turns off, the others turn off, too.

An electric current is traveling in a wire. A compass is placed under the wire with the current flowing from north to south. In response, the compass needle will-

• rotate because of a magnetic force that acts on the needle

• rotate because of an electric force that acts on the needle

• not move because moving electric charges do not exert magnetic forces on the needle

• not move because moving electric charges do not exert electric forces on the needle

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Diagrams of electric fields and magnetic fields often look similar. What is an important difference between electric field lines and magnetic field lines?

• Electric field lines always point away from the object generating the field, while magnetic lines always point toward it.

• Electric field lines are close together where the electric field is strong, but magnetic lines are close where the magnetic field is weak.

• Electric field lines start and end on charges, while magnetic field lines form closed-loop paths to and from the poles.

• Magnetic field lines cannot cross, while electric field lines can

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

An electric current flows in a wire. What is one result?

• a magnetic field is created

• any nearby magnetic fields are destroyed

• nearby magnets lose their strength

• the metal of the wire cannot be affected by magnets

Tags

NGSS.HS-PS2-5

Why must every electric circuit have a voltage source, such as a battery?

• Without a voltage source, the resistance would be too high

• Without a voltage source, the resistance would be too low

• Without a voltage source, there would be no electrons in the circuit

• Without a voltage source, there would be no source of current

What happens if there is a break at any point in a series circuit?

• no current flows

• current flows through an alternative path

• resistance goes to infinity

• current reverses direction