Direction of Magnetic Field

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Presentation transcript:

Direction of Magnetic Field Regular Magnet N S

Moving Charge induces Magnetic Field Current thru Coil Moving Charge induces Magnetic Field

Coil Thru Magnetic Field Moving coil in magnetic field: Electric current is induced

Current thru Coil, w/ Strong Magnet Moving Magnetic Field induces Electric Current Oscillating Magnet induces Oscillation Current (AC)

Magnet & Copper Lenz’s Law: Moving Magnetic Field induces Current Current induces 2nd Magnetic Field 2 Magnetic Fields Interact

Magnetic Induction Moving magnet (field) “causes” current in a wire. Moving magnet (field) “induces” current in a wire. Current (moving charge) induces a magnetic field Current thru a wire can exert a force on a magnet Magnetic Field can exert a force on a current-carrying wire Lenz’s Law- moving magnetic field induces a current, which induces a 2nd magnetic field Moving magnet (field) “causes” current in a wire.

Current – interchangeable with velocity 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)

Right Hand Rule #1 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 v B F http://www.physics.brocku.ca/faculty/sternin/120/slides/rh-rule.html

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

Right Hand Rule #1 LEFT If the charge is negative, then just use your left hand! Helpful Hint: Current is considered the flow of POSITIVE charge v B F http://www.physics.brocku.ca/faculty/sternin/120/slides/rh-rule.html

Right Hand Rule #2 B This is an easy one! A Magnetic Field wraps around a current-carrying wire I http://physics.pingry.org/Explorations/Magnetism/RightHand/Media/Solenoid.gif

Right Hand Rule #2 What if the wire is not straight, but a loop? Thumb- B field Fingers- Current B