Which of the following are true, regarding magnetic fields and forces? Select al

Question

Which of the following are true, regarding magnetic fields and forces?
Select all that are True.
a. Earth's north magnetic pole is currently near the planet's south geographic pole.
b. If a positively-charged particle is moving in counterclockwise circles in the plane of the screen, the magnetic field must be pointing into the screen.
c. Magnetic forces can perform work on charged particles.
d. Magnetic field lines exit the south pole of a bar magnet and enter its north pole.
e. The maximum magnetic force on a charged particle occurs when the particle's velocity is parallel to the magnetic field.
f. If a charged particle is moving in circles in a magnetic field, and the radius of its circular path is decreasing, its speed must be increasing.

Explanation / Answer

2. Earth's north magnetic pole is currently near the planet's south geographic pole.

5. If a positively-charged particle is moving in counterclockwise circles in the plane of the screen, the magnetic field must be pointing into the screen.

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