physics

With Magnets

• like poles attract one another

• like poles repel one another

• unlike poles repel one another

• answer not provided

A magnet on a frictionless mount would have its magnetic north pole point toward the
Earth’s geographic

• North Pole

• South Pole

The magnetic field lines of a bar magnet

• emerge from the south pole and go back into the south pole 

•  

  emerge from the north pole and go back into the north pole

•  

  emerge from the north pole and go into the south pole

•  

  emerge from the south pole and go into the north pole

The magnetic field lines produced by a current in a straight wire 

are directed in concentric circles around the wire

•  

  are directed in concentric circles around the wire

•  

  are directed outward in a direction perpendicular to the wire

•  

  begin on one side of the wire and end on the other side of the wire

The SI unit of the magnetic field is

• farad

• tesla

• guass

• weber

The strongest part of a magnet is

• the poles

• the bars

• the middle

• 1 cm away from the poles

Why does each electron in an atom behave like a tiny magnet  

•  

  The spinning of an electron produces a magnetic field.

•  

  The spinning of an proton produces a magnetic field.

An electromagnet is which of the following?

• Temporary magnet

• Permanent magnet

Which of the following is true about an electromagnet and a permanent magnet? 

•  

  An electromagnet can never be as strong as a permanent magnet.

•  

  A permanent magnet may be weaker than an electromagnet.

Which of the following is a way to induce a voltage in a wire?

•  

  Moving the wire between the poles of a magnet

•  

  Moving the wire near a battery

•  

  Moving the wire through the air at random