Magnetic Forces and Fields

Front

Describe how the movement and force on electrons in the model produce a magnetic force.

Back

The movement of electrons creates a magnetic field, and the force on them aligns with the field.

Front

Steps to determine which side of a bar magnet is north (N) or south (S).

Back

Place the bar magnet near the known pole of a second magnet and observe the interaction between the poles.

Front

Compare the fields produced in the space between each pair of magnets. Describe the pairs of magnets.

Back

The magnets in pair A are oppositely magnetized and have more single electrons in their outer shells since they have a stronger magnetic moment and magnetic field.

Front

How could the student adjust the fields to cause the particle to have a greater acceleration within the gap and a wider turn through the dees?

Back

Increasing the electric field and the magnetic field on the particle will cause the particle to have a greater acceleration and wider turn through the dees, since it will experience a stronger Lorentz force.

Front

What happens to the electric field as the charged particle moves from one dee to the other?

Back

The electric field changes direction.

Front

What effect does changing the electric and magnetic fields have on a particle's acceleration and turn through the dees?

Back

Only C is correct.

Front

A beam of electrons is sent into the cyclotron. While the particle is moving through the magnetic field, the magnetic force on the particle is recorded. The particle's data are shown in the table. What is the strength and direction of the magnetic field on the particle?

Back

1.18 T, into the page

Front

A student conducts an experiment to compare the strength of the magnetic fields of four magnets, as shown. The student places each magnet the same distance above a pile of metal paper clips and records the maximum number of paper clips each magnet collects. Based on the magnetic field lines shown, which magnet(s) will pick up the most paper clips?

Back

Magnets A and D will collect the most paper clips since they have the most field lines regardless of direction, indicating they have the strongest magnetic fields. Magnet C will collect the least number of paper clips since it has the least number of field lines.

Front

Steps to transform a ferromagnetic material into a permanent magnet using a ferromagnetic material, two bar magnets, a compass, and a heat source.

Back

Use the bar magnets to align the domains of the ferromagnetic material, then apply heat to fix the alignment.

Front

A student is going on a road trip. While driving, the student uses a compass, a map, and a GPS to investigate the difference between the magnetic and geographic poles. Using the GPS, the student drives toward the geographic North pole. Based on the compass, what direction, both geographic and magnetic, is the student driving in, and what is a source of inaccuracy in the student's investigation?

Back

The student is driving north geographically and south magnetically; the inaccuracy is due to magnetic declination.