• Magnetic Field– Symbol: B– Units: Who cares?

• Force– Symbol: F– Units: You’d better know this one!

• Velocity– Symbol: v

• Current – interchangeable with velocity– Symbol: I – (as in “I don’t know why the symbol for Current

is I!”)

•Up •Down•Left•Right•Out (towards)•In (away)

• How do you tell if the force is up or down on the Positive Charge?

• Use the Right Hand Rule #1!– v – thumb– B – index finger– F – middle finger

Right Hand Rule #1v

B

F

http://www.physics.brocku.ca/faculty/sternin/120/slides/rh-rule.html

• Funny- what happens when Force is always perpendicular to v ?

B

Right Hand Rule #1• A magnetic field

(B) will exert a force on a charge only if it is moving perpendicular to the field

• As it turns out, the direction of the Force is perpendicular to both B & v

F

v

F

v

• If the charge is negative, then just use your left hand!

• Helpful Hint:– Current is

considered the flow of POSITIVE charge

v

B

F

Right Hand Rule #1LEFTLEFT

http://www.physics.brocku.ca/faculty/sternin/120/slides/rh-rule.html

Right Hand Rule #2• This is an easy

one!• A Magnetic Field

wraps around a current-carrying wire

http://physics.pingry.org/Explorations/Magnetism/RightHand/Media/Solenoid.gif

I

B

• What if the wire is not straight, but a loop?

• Thumb- B field• Fingers- Current

Right Hand Rule #2

I

B