Learn the Right hand Rules???
Started by ahs4n
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F=q(v x B)
where F is the magnetic force on a moving charged particle, v is the velocity of the moving particle, and B is the magnetic field. Notice that these are all vectors (except the charge, q) and all have directions in which you can use the right hand rule for. Remember that the right hand rule is only for MAGNETIC forces and the force vector is for a (+) charge only (negative charge is reverse). As you can tell by the equation, the particle must have a charge and be moving in order to have a force on it.
http://commons.wikimedia.org/wiki/File:Right_Hand_Rule_vBF2.PNG
Just match up the respective vectors to find the direction of the force. Sometimes they give you the force and either the velocity or B field in which you have to find the last component.
where F is the magnetic force on a moving charged particle, v is the velocity of the moving particle, and B is the magnetic field. Notice that these are all vectors (except the charge, q) and all have directions in which you can use the right hand rule for. Remember that the right hand rule is only for MAGNETIC forces and the force vector is for a (+) charge only (negative charge is reverse). As you can tell by the equation, the particle must have a charge and be moving in order to have a force on it.
http://commons.wikimedia.org/wiki/File:Right_Hand_Rule_vBF2.PNG
Just match up the respective vectors to find the direction of the force. Sometimes they give you the force and either the velocity or B field in which you have to find the last component.
S
Segovia
This is a decent breakdown:
http://www.youtube.com/watch?v=9Zy0VHBXxLU&feature=related
Alternatively, if the right hand rule is a troublesome concept, as it was for me, you can use unit vectors. If you use unit vectors i,j,k to and assign them to qv and B, you will never have to throw gang signs during the test, and you will never get one of these wrong again.
The downside is, it takes a couple of hours to learn this way, and most people prefer the right hand rule. Plus, you have to define a coordinate system and stick with it, but it is really not that bad. After practice, it takes about 10 seconds to answer using unit vectors no matter if the charge is negative or positive.
http://www.youtube.com/watch?v=9Zy0VHBXxLU&feature=related
Alternatively, if the right hand rule is a troublesome concept, as it was for me, you can use unit vectors. If you use unit vectors i,j,k to and assign them to qv and B, you will never have to throw gang signs during the test, and you will never get one of these wrong again.
The downside is, it takes a couple of hours to learn this way, and most people prefer the right hand rule. Plus, you have to define a coordinate system and stick with it, but it is really not that bad. After practice, it takes about 10 seconds to answer using unit vectors no matter if the charge is negative or positive.
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I remember having needed this during the mcat.
Use the right hand for positive charge:
Thumb: direction of current or velocity
Straight fingers (except your thumb): direction of magnetic field
palm: direction of FB
dorsal side of hand: direction of FE
There supposedly isn't a left hand rule... but I use the my left hand for negative charge.
Use the right hand for positive charge:
Thumb: direction of current or velocity
Straight fingers (except your thumb): direction of magnetic field
palm: direction of FB
dorsal side of hand: direction of FE
There supposedly isn't a left hand rule... but I use the my left hand for negative charge.
Like all concepts in physics and chemistry which involve rules or equations, I of course came up with sexual/dirty mnemonics or ways to remember them. My one for right-hand rule is no exception.
