Which one of the following statements is true? A. The north pole of a compass needle is actually being attracted to the south geographical pole of the Earth. B. The north pole of a compass needle is actually being attracted to the north geographical pole of the Earth. C. The north pole of a compass needle is actually being attracted to the south magnetic pole of the Earth. D. The north pole of a compass needle is actually being attracted to the north magnetic pole of the Earth.

9. A electron with charge -1.60 × 10-19 C and mass 9.11 × 10-31 kg is accelerated from rest through 14.20 kV. It then enters a uniform magnetic field of 7.50 x 10-4 T that is oriented perpendicular to its direction of motion. (a) What is the radius of the path the electron follows in the magnetic field? (b) How long does it take the electron to make one complete circle in the magnetic field?

1. Consider a beam of electrons that moves from the electron gun towards the screen of a cathode ray tube due to the potential difference of 15kV. A pair of coils are placed outside a cathode ray tube and produce a uniform magnetic field of 250 μT across the tube. Calculate the force experienced by the electrons if the magnetic field is in place: a. parallel with the direction of the beam. b. Perpendicular with the direction of the beam. c. 50 degrees with the direction of the beam.

*42. A bar magnet is divided into two pieces. Which of the following statements is true about the force between the broken pieces if they face each other with a small separation? Group of answer choices There is an electric attractive force between the broken pieces. There is an electric repulsive force between the broken pieces. There is a magnetic attractive force between the broken pieces. There is a magnetic repulsive force between the broken pieces.

5. A proton (m₂ = 1.67 x 10-27 kg; e = 1.60 x 10-19 C) enters a 14 T field in a direction par- allel to the direction of the magnetic field. The proton is moving at 105 m/s. What is the mag- nitude of the force felt on the proton?

What is the meaning of the word "permanent" when used to describe a magnet? a. Magnetism depends on the realignment of domains in the magnetic material. b. Atoms inside the material are themselves tiny magnets. c. Magnetic effects move nearby objects to new positions. d. Magnetism persists independent of other magnetic objects. e. Magnetism is induced by the presence of nearby magnetic objects.