Magnets and Electricity

What happens if you break a magnet in half?

• One half will have a north pole only and one half will have a south pole only
• Neither half will have a pole
• Each half will be a new magnet, both halves will have a N and S pole
• Neither half will be able to attract or repel

2 balloons are rubbed with a wool cloth.  When the balloons are held together they repel each other.  Why does this happen?

• The balloons have the same magnetic charge so they repel each other
• The balloons have opposite magnetic charges so they repel each other
• The balloons have the same electric charge so they repel each other
• The balloons have opposite electric charges so they repel each other

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What is magnetism?

• A force of attraction or repulsion of magnetic materials
• A machine that converts electrical energy to mechanical energy
• A machine that converts mechanical energy to electrical energy
• The flow of thermal energy

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What is a motor?

• A force of attraction or repulsion of magnetic materials
• A machine that converts electrical energy to mechanical energy
• A machine that converts mechanical energy to electrical energy
• A machine that monitors and adjusts the flow of thermal energy

What is a generator?

• A force of attraction or repulsion of magnetic materials
• A machine that converts electrical energy to mechanical energy
• A machine that converts mechanical energy to electrical energy
• A machine that monitors and adjusts the flow of thermal energy

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What is 1 way of destroying a magnet?

• Putting it in water
• Slowly cooling it
• Heating it
• Breaking it into 2 pieces

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The closer together a magnetic or electric field's lines are:

• The stronger the magnetic or electric field
• The weaker the magnetic or electric field
• The better chance of static magnetism to occur along the center of the magnet
• The less chance of static magnetism to occur along the center of the magnet

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What happens after you rub a balloon or a wool cap against your hair?

• Nothing, opposite charges always repel
• Nothing, similar charges always attract
• Your hair, losing electrons, would be negative and the hat or balloon would gain electrons and have a positive charge resulting in attraction between your hair and the balloon
• Your hair, losing electrons, would be positive and the hat or balloon would gain electrons and have a negative charge resulting in attraction between your hair and the balloon

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Wires in the cables of household appliances have plastic coverings.  This is because plastic

• Absorb heat really well
• Can be bent to any shape
• Are poor conductors of electricity
• Are really cheap

After turning off your television, you approach it.  You get close, but do not touch the tv.  As you get close, the hairs on your arms stand up.  This is an example of static charge built up by:

• Conduction
• Convection
• Induction
• Radiation

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