Question

how we find force by use right hand thumb

Answer 1

The right hand rule states that, to find the direction of the magnetic force on a positive moving charge, the thumb of the right hand point in the direction of v, the fingers in the direction of B, and the force (F) is directed perpendicular to the right hand palm.

Answer 2

hey.....
good morning....
here is your answer....
The right hand rule states that, tofind the direction of the magneticforce on a positive moving charge, the thumb of the right hand point in the direction of v, the fingers in the direction of B, and the force (F) is directed perpendicular to the right handpalm.
hope it helps u....