an object is horizontally dragged across surface by 100 N force acting parallel to the surface . find out the amount of work done by force in moving the object through distance 8 m

An electron moving at 5.06 103 m/s in a 1.23 t magnetic field experiences a magnetic force of 1.40 10-16 n. what angle does the velocity of the electron make with the magnetic field? there are two answers between 0° and 180°. (enter your answers from smallest to largest.)