8.6 Electricity and Magnetism Review

When a bar magnet is broken,

• both pieces will have north and south poles
• both pieces will have one pole
• the two pieces have a stronger magnetic field
• the two pieces will repel eachother

This material allows electrons to flow easily through it

• conductor
• insulator
• solid
• liquid

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Which of the following would increase the magnetic force of a solenoid?

• increasing the number of loops
• spacing the loops further apart
• decreasing the current
• adding an insulator as the core

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A coil of wire with electricity flowing through it is called a

• solenoid

• magnet

• commutator

• armature

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Which is true of transformers?

• The side with more loops will have a greater voltage
• the side with less loops will have greater voltage
• an insulated core can connect both loops
• the side with less loops will have less resistance

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current measures the amount of __________ flowing through a circuit

• electrons

• volts

• ohms

• neutrons

The principle that "opposites attract" applies to…

• both electricity and magnetism
• electricity
• magnetism
• life

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How is a magnet able to pick up bits of metal without touching them?

• There is an invisible magnetic field around the magnet
• The magnet is surrounded by an electrical field that attracts the metal
• The metal exerts a repulsive force on the magnet.
• Electrical force form the magnet attracts bits of the metal

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How does earth's magnetic field protect life on earth?

• it directs charged particles to the poles and then past earth

• it absorbs charged particles

• it directs particles to the poles, where they are absorbed

• it directs particles toward earth's equator

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Which statement describes why current flows in a circuit?

• Voltage is when current flows from higher to lower potential energy.
• Voltage is when current flows from lower to higher potential energy.
• Amperes is when current flows from lower to higher potential energy.
• Amperes is when current flows from higher to lower potential energy.

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