electricity and magnetism

Any magnet has two ends, each one called a:

• A. Magnetic field

• B. Magnetic pole

• C. Magnitized material

• D. None of the above

Which device can be used to determine the polarity of an unmarked magnet?

• A. a charged glass stirring rod

• B. a gold-leaf electroscope

• C. a sprinkle of iron filings

• D. an improvised compass

What transformation can take place in an improvised generator?

• a. mechanical energy into electrical energy

• b. electrical energy into mechanical energy

• c. alternating current into direct current

• d. direct current into alternating current

What transformation can take place in a ceiling fan’s electric motor?

• a. electrical energy into mechanical energy

• b. mechanical energy into electrical energy

• c. alternating current into direct current

• d. direct current into alternating current

What would NS SN do if two magnets were in this order?

• A. Repel

• B. Attract

• C. Do nothing

• D. Fly away

How will you describe the magnetic field around a current-carrying coil?

• a. The magnetic field is weakest near and around the coil.

• b. The magnetic field vary directly with the distance from the coil.

• c. The magnetic field is strongest inside the current-carrying coil.

• d. The magnetic field lines are closed loops along the loops in the coil.

in which device is magnetic field present?

• a. A charged balloon.

• b. A cooling soldering iron.

• c. A very hot horse-shoe magnet.

• d. A microphone undergoing a sound check.

A magnet made of a material that keeps its magnetism is known as a:

• A. Lifetime magnet

• B. Energizer bunny magnet

• C. Permanent magnet

• D. Temporary magnet

If two magnets were in this order: NS NS they would:

• A. Repel

• B. Attract

• C. Do nothing

• D. Fly away

Which device can be used to determine the polarity of an unmarked magnet?

• a. a suspended magnetized needle

• b. an improvised magnetic board

• c. a second unmarked magnet

• d. a charged metal rod at rest