Week

Magnetism

Objective

Student will:Demonstrate Magnetic Fields and Forces

Cornell Notes (1/6)

A magnetic field is a region in which a magnetic force can be detected A magnetic field can be shown with field lines like below

Cornell Notes (2/6)

A long straight current carrying wire has a cylindrical magnetic fieldThe right hand rule can be used to determine the direction of the magnetic field in a current carrying wire

The Right-HandRule

Cornell Notes (3/6)

Solenoids produce a strong magnetic field by combining several loopsA Solenoid is a long helically wound coil of insulated wire

Cornell Notes (4/6)

A charge moving through a magnetic fields experiences a force proportional to the charge velocity and the magnetic field

The Unit for Magnetic field is a Tesla =T

B F

magnetic

qv

magnetic field = magnetic force on a charged particle

(magnitude of charge)(speed of charge)

Cornell Notes (5/6)

Alternate Right Hand Rule can be used find the direction of a magnetic field

Cornell Notes (6/6)

A current carrying wire in an external magnetic field undergoes a magnetic force

Current is measured in Amperes=A

magnitude of magnetic force = (magnitude of magnetic field)

(current) (length of conductor within B)

Cornell Notes (1/4)

Example: Magnetism

Magneto is trying to gauge his power by conducting a magnetism experiment. He sends a 10 A current upward though a .5m rod. This produces a magnetic force of 8 N. What is the magnetic field around the object and what direction in is going?

Cornell Notes (2/4)Given:

F= 8N

I = 10A

L = .5m

Unknown: B= ?

Steps1) Define

Magneto is trying to gauge his power by conducting a magnetism experiment. He sends a 10 A current upward though a .5m rod. This produces a magnetic force of 8 N. What is the magnetic field around the object and what direction in is going?

Cornell Notes (3/4)Choose an equation or situation:

Rearrange the equation to isolate the unknown:

2) Plan

𝐹=𝐵𝐼𝑙

𝐹=𝐵𝐼𝑙

Cornell Notes (4/4)Substitute the values into the equation and solve

3) Calculate

𝐹𝐼𝑙

=B