magnetism

The strongest part of a magnet is...

• the bars.
• the force field.
• the poles. 
• the middle.

If positive x-axis is symbolized as current flow and positive z-axis is symbolized as magnetic field direction. then the direction of the Lorentz force is symbolized as ....

• positive x-axis

• negative y-axis

• positive y-axis

• negative z-axis

A coil of wire acts like a magnet when __________________ flows through it.

• water

• current

• voltage

• food

You can make an electromagnet stronger by: using a __________________ material for the core.

• soft

• conducting

• magnetic

• hard

A positive charge moving toward the bottom of the page encounters a magnetic field pointed toward the right of the page. What direction does the charge get pushed?

• up

• down

• into the page

• out of the page

A 2 C charge moving at 15 m/s enters into a magnetic field of strength 5 T. What is the maximum force experienced by this charge?

• 150 N

• 150 N into the page

• 360 N

• 360 N out of the page

In what direction is the electric current flowing according to right hand rule 2?

• Up

• Down

• Left

• Right

Two long parallel wires carry currents in opposite directions. The top wire carries a current to the left, while the bottom wire carries a current to the right. The wires are not touching. Do the wires attract each other or repel?

• Attract

• Repel

A 2.0 m long wire carrying 10 A of current moves through an 6.0 T magnetic field. What is the magnetic force acting on the wire?

• 10 N

• 120 N

• 0.5 N

• 2 N

Generators are devices that convert ______ energy into ______ energy.

• chemical; mechanical
• mechanical; electrical
• electrical; mechanical
• potential; kinetic