Question

Assume that the magnetic field exists and its direction is known. Then assume that a charged particle moves in a specific direction through that field with velocity (v). Which rule do you use to determine the direction of force on that particle? 

fourth right-hand rule
third right-hand rule
first right-hand rule
second right-hand rule

Answer 1

Fourth right-hand rule

Step-by-step explanation:

Answer 2

The correct answer is
First right-hand rule.

This rule helps determining the direction of the force on a positive charge moving in a magnetic field:
- the index finger represents the direction of the charge velocity
- the middle finger represents the direction of the magnetic field
- the thumb gives the direction of the magnetic force