Register to reply

Confusion on applying right hand rule

by Genericcoder
Tags: applying, confusion, hand, rule
Share this thread:
Nov23-13, 12:07 PM
P: 131
Hi guys I always get confused when I do the right hand rule like here when I apply it to this problem I am getting different answer than what the book have.

A uniform magnetic field B, with magnitude 1.2 mT, points vertically upward throughout the volume of the room in which you are sitting. A proton with kinetic energy of 5.3 MeV moves horizontally to the north through a certain point in the room. What magnetic deflecting force acts on the proton as it passes through this point ? The proton mass is 1.67 * 10^-27 kg.

so Fb = 6.1 * 10^-15 N; the book then says the force is sideways in horzontally to the east. I am getting it pointing in the z direction even when using cross product

FB = q<v,0,0> x <0,B,0>

Fb = qvB k^ direction
Phys.Org News Partner Science news on
What lit up the universe?
Sheepdogs use just two simple rules to round up large herds of sheep
Animals first flex their muscles
Nov23-13, 12:35 PM
Sci Advisor
P: 3,717
What's your convention for relating north/south, east/west, and up/down to the x, y, and z axes? You know you've mixed something up if the force isn't perpendicular to the B field and the velocity.

(I'm assuming that you are using i,, j, and k as unit vectors in the x, y, and z directions respectively).
Nov23-13, 01:36 PM
P: 131
Ye I am using i j k as unit vectros x,y,and z directions respectively.. but I think thats what I have not relating north/south up down to x and y and z directions..

Nov23-13, 02:52 PM
P: 1,948
Confusion on applying right hand rule

Shouldn't your field be (0,0,B)?

Register to reply

Related Discussions
Applying the left/right hand rule to a wire with current General Physics 16
Right hand rule confusion Introductory Physics Homework 4
Stats: Multiplication Rule & Counting Rule Confusion Precalculus Mathematics Homework 1
Right hand palm rule and right hand clasp rule General Physics 3
Right hand rule Calculus & Beyond Homework 7