Exam 2 Practice (Fields and Waves)

What causes a material to be magnetic?

• The atoms align their magnetic poles into a magnetic field.
• It is made from non metallic materials
• The atoms line up when hammered or heated
• It has been exposed to volcanic activity

Which of the following will keep its magnetic properties for a long time?

• Permanent magnet
• Temporary magnet
• Electromagnet
• Magnetic domain

Like poles or charges __________ while opposite poles or charges _____________.

• Attract, repel
• Repel, attract
• Repel, repel
• Attract, attract

Where is the magnetic field strongest in a magnet?

• At the North pole
• At the South pole
• At the sides between the poles
• At both poles

How is a temporary magnet made?

• By rubbing iron or steel with a permanent magnet until it's domains are aligned
• By melting down a permanent magnet
• By gluing a north pole from one magnet to a south pole of another magnet
• By wrapping cloth in wire and plugging it into a battery

What must be true for a compass to help people navigate on Earth?

• There must be no other magnetic fields in the solar system
• The Earth acts like a giant magnet
• There must be nothing in the way between the compass and the North pole
• There needs to be clear skies

Loose electrons are referred to as ______ ______.

• DC current
• AC current
• Protons and Neutrons
• Static Electricity

Which of the following is a material through which electric current flows easily?

• Styrofoam
• Rubber
• Water
• Paper

What do we call a material that DOES NOT allow electricity to easily flow through it?

• Conductor
• Insulator
• Friction
• Induction

Which of the following has an alternating current so it allows electricity to flow in two directions?

• AC
• DC
• BC
• AD