Unseen Forces Review

How do you increase the strength of an electromagnet?

• add more magnets

• larger core

• increase the number of coils around the core

• salt water

What would cause two balloons to repel?

• one is positive and one is negative

• both balloons are positive

• both balloons are negative

• one balloon is positive and one is neutral

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Two things with opposite charges will

• attract one another.
• repel one another.

How can the strength of an electromagnet be increased? (mark all that apply)

• increase the current flowing through the coil

• increase the number of coils

• add an amplifier to it

• put iron core inside the coil

What are the components of the electromagnets?

• battery, wire and bulb

• battery , copper wire and paper clips

• battery, copper wire and iron nail

• battery, wire and aluminum

How do you make an electromagnet stronger?

• Add a motor and/or lightbulbs
• Add more light bulbs and/or wire coils
• add more wire coils and/or a switch
• add more wire coils and/or batteries

What will happen when these magnets are brought close together?

• They will attract each other.
• They will repel each other.
• Both magnets will turn to the left
• Both magnets will turn to the right

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What type of process is shown?

• Electromagnet

• Electric motor

• Electric generator

• Electromagnetic induction

Which electromagnet would be stronger?

• Left

• Right

Tags

NGSS.MS-PS2-3

Which diagram best demonstrates how the student can use the magnet and wire coil to produce electricity?

• 
• 
• 
•