Apositive charge is moving from the floor of a room toward the ceiling. a magnetic field runs from east to west. in what direction is the magnetic force on the moving positive charge?
a. toward the north
b. toward the south
c. toward the east
d. toward the west
e. toward the floor

"Towards south" is the one among the following choices given in the question that is the direction of the magnetic force on the moving positive charge. The correct option among all the options that are given in the question is the second option or option "B". I hope that the answer has actually come to your help.

Answer;

B. toward the south

Explanation;The right hand rule to determine the direction of magnetic force. This rule state that if the thumb, the fore finger, and the middle finger of the right hand are held at right angles to one another, with the fore finger pointing in the direction of the magnetic field, and the middle finger pointing in the direction of the positive charge, then the thumb will point in the direction of the magnetic force.In this case, the positive charge is moving from the floor towards the ceiling, the magnetic field from east to west direction, thus  suing the right hand rule, the direction of the magnetic force will be towards the south.