When a charged particle is moving in a static uniform magnetic ...

[nelaaney]

When a charged particle is moving in a static uniform magnetic field
 
  A) there will always be a magnetic force exerted on it, regardless of its direction of motion.
  B) there may be a magnetic force exerted on it which will cause its speed to change.
  C) there may be a magnetic force exerted on it, but its speed will not change.
  D) there may be a magnetic force exerted on it, but its direction of motion will not change.
  E) None of the above statements are true.

Question 2

On a cold winter day, the outside temperature is -20C and the inside temperature is maintained at 20C. There is a net thermal energy flow to the outside through the walls, roof, etc., of 25 kW.
 
  What is the rate of increase of the entropy of the universe as a result of this energy flow? A) 13 W/K
  B) 25 W/K
  C) 85 W/K
  D) 99 W/K
  E) 0 W/K

[IRincones]

Answer to Question 1

C

Answer to Question 2

A