Magnetism and Force (Doug G7 Ch20 Conceptual)

If you were to cut a small permanent bar magnet in half,

• one piece would be a magnetic north pole and the other piece would be a south pole.

• neither piece would be magnetic.

• each piece would in itself be a smaller bar magnet with both north and south poles.

• None of these statements is true.

A straight bar magnet is initially 4 cm long, with the north pole on the right and the south pole on the left. If you cut the magnet in half, the right half will

• contain only a north pole.

• contain a north pole on the right and a south pole on the left.

• contain only a south pole.

• no longer contain any poles.

Which one of the following statements is correct?

• Earth's geographic north pole is the north pole of Earth's magnetic field.

• Earth's geographic south pole is the south pole of Earth's magnetic field.

• The north pole of a magnet points towards Earth's geographic north pole.

• The north pole of a magnet points towards Earth's geographic south pole.

• None of the above statements is correct.

A positive charge is moving to the right and experiences an upward magnetic force, as shown in the figure. In which direction must the magnetic field have a component?

• to the right

• to the left

• upward

• out of the page

• into the page

A charged particle that is moving in a static uniform magnetic field

• will always experience a magnetic force, regardless of its direction of motion.

• may experience a magnetic force which will cause its speed to change.

• may experience a magnetic force, but its speed will not change.

• may experience a magnetic force, but its direction of motion will not change.

• None of the above statements are true.

An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, then the magnetic field must have a component

• along the +z-axis

• along the -z-axis

• along the -x-axis

• along the +y-axis

• along the -y-axis

An electron, moving south, enters a magnetic field. Because of this field, the electron curves upward. We may conclude that the magnetic field must have a component

• downward.

• towards the east.

• upward.

• towards the west.

• towards the north.

A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. We may conclude that the magnetic field must have a component

• downward.

• upward.

• towards the east.

• towards the west.

• towards the north.

An electron, moving west, enters a magnetic field. Because of this field the electron curves upward. We may conclude that the magnetic field must have a component

• towards the north.

• towards the south.

• upward.

• downward.

• towards the west.

A proton, moving west, enters a magnetic field. Because of this magnetic field the proton curves upward. We may conclude that the magnetic field must have a component

• towards the west.

• towards the east.

• towards the south.

• towards the north.

• downward.