When you are in the southern hemisphere, does a compass point north or south?

An electron in the beam of a TV picture tube is accelerated by a potential difference of 1.94 kV. Then it passes through a region of the transverse magnetic field, where it moves in a circular arc with a radius of 0.178 m. What is the magnitude of the field? Use 9.11×10−31 kg for the mass of an electron and 1.60×10−19 CC for the magnitude of the charge on an electron.

In what direction is the force F→ exerted by the magnetic field on the electron? In what direction is the force  exerted by the magnetic field on the electron? F→ is parallel to the wire and points upward. F → is parallel to the wire and points downward. F→ is perpendicular to the wire and points toward the wire. F → is perpendicular to the wire and points away from the wire.   If the magnetic field of the wire is 3.5×10−4 T and the electron moves at 4.0×106 m/s , what is the magnitude F of the force exerted on the electron?

(a) At what speed (in m/s) will a proton move in a circular path of the same radius as an electron that travels at 7.25 x 106 m/s perpendicular to the Earth's magnetic field at an altitude where the field strength is 1.05 × 10-5 T? m/s (b) What would the radius (in m) of the path be if the proton had the same speed as the electron? (c) What would the radius (in m) be if the proton had the same kinetic energy as the electron? (d) What would the radius (in m) be if the proton had the same momentum as the electron?