CP Ch10.3 Electromagnets

How are electromagnets created?

• By placing copper in a current-carrying coil

• By placing iron in a current-carrying coil

• By placing aluminum in a current-carrying coil

• By placing gold in a current-carrying coil

What do compass needles demonstrate about the magnetic field surrounding a current-carrying wire?

• Rectangular shape

• Triangular shape

• Circular shape

• Square shape

How does increasing the number of loops in a coil affect the magnetic field intensity?

• Decreases the magnetic field intensity

• Has no effect on the magnetic field intensity

• Causes the magnetic field intensity to fluctuate

• Increases the magnetic field intensity

Why do magnets levitate above superconductors?

• Due to the inability of magnetic fields to penetrate the surface

• Due to the high temperature of the superconductor

• Due to the weight of the magnet

• Due to the color of the superconductor

What happens to the magnetic field lines inside a loop when a wire is bent into a loop?

• They spread out evenly

• They disappear

• They bunch together

• They reverse direction

What is produced around any wire carrying an electric current?

• Electric charge

• Heat

• Magnetic field

• Light

What is one application of superconducting electromagnets?

• Generating electricity

• Creating magnetic fields

• Levitating high-speed trains

• Heating up materials