Two electrons are located in a region of space where the magnetic field is zero. Electron A is at rest; and electron B is moving westward with a constant velocity. A non zero magnetic field directed eastward is then applied to the region. In what direction, if any will each electron be moving after the field is applied?

Electron A It remains stationary, while electron B continues moving westward

Explanation:

The force acting on each electron is given by F = Bevsinθ where B = magnetic field strength, v = velocity of electron, e = electron charge and θ = angle between B and v

Force electron A, v = 0, and θ = unknown, so F = Be × 0 × sinθ = 0.

So, no force acts on it and thus, it does not move. It remains stationary.

Force electron B, v = constant, acceleration, a = 0 and θ = 180, so F = Bevsin180 = 0.

So, no net force acts on it and thus, it does not change direction. It continues moving westward.

d. platinum would have the greatest temperature increase because it has the lowest specific heat.