Question

When applying the right-hand rule for force (sections 27-3 and 27-4), first point your fingers in the direction of the ____.

a. current (or velocity of charge carriers)

b. field

c. force

Answer 1

ans:- B) field

The direction of the magnetic force Fis perpendicular to the plane formed by v and B as determined by the right hand rule. It states that, to determine the direction of the magnetic force on a positive moving charge, you point the thumb of the right hand in the direction of v, the fingers in the direction of B, and a perpendicular to the palm points in the direction of F. One way to remember this is that there is one velocity, and so the thumb represents it. There are many field lines, and so the fingers represent them. The force is in the direction you would push with your palm. The force on a negative charge is in exactly the opposite direction to that on a positive charge.