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19_magnets_09_10

# 19_magnets_09_10 - Chapter 19 Magnetism Magnetic Fields...

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Chapter 19: Magnetism Magnetic Fields have units of __________________. Magnetic Fields have a symbol (____) Draw the Magnetic Field lines of: A bar magnet: Earth Note: The magnetic field lines go _________ of the North side of the magnet and into the _____________ side of the magnet. (Think, you can fill this in on your own) In the year _________ Hans C Oersted _______________________________________. Right Hand Rule #1: Use : To find the direction of __________ produced by __________________________ How to use it : Point your _____________________ in the direction of the ___________ (or E field) and your f________________ will curl in the direction of the ____________ Illustrating Magnetic Fields Draw a field towards you: Draw a field away from you: Example: Find the direction of the B field at point A created by the electric current flowing ___________ the page. Examples: (Draw the B-field) Wire: Solenoid (wire loop):

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Ampere’s Law Use: To find the B Field a distance R away from a straight current (I) carrying conductor. Example Picture: Where μ o = 4 π x10 -7 T•m/A Example : At one instant a +2 ion moving with a velocity of 1000m/s is ___m from a current carrying wire of 50 A. (a) What is the B-field at the location of the ion? An object moving in a magnetic field may experience a magnetic force. 1. Object must have a __________________ (electron, proton, -1 ion) 2. The magnetic force on a _______________ charge is __________. 3. The magnetic force on a charge that is ____________________________________ of the magnetic field is also ________________. 4. The magnetic force is _______________ on a charge that is ____________________ to the magnetic field. Equation for the Magnetic Force: Where: Q = Charge of the particle (units C) V = the velocity of the particle (units m/s) B = the magnetic field (units T) Why is the sin θ needed? Charge Velocity , B Field , and the Force produced, are all at right angles to each other. This leads to… Right Hand Rule #2: Use : To find either the direction of charge velocity, the B field, or the force using the other two. How to use it : Put your right thumb in the direction of the ______________ and your fingers in the direction of the __________________. Then your fingers will bend or curl in the direction of the ____________________. Important : This only works for a positive charge . The direction of the force on a negative charge is ___________________ that for a positive charge.
Example: Find the direction of the magnetic Force acting on an ______________ moving ______________ the magnetic field lines.

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