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Agenda Bell work• Magnet activity• Notes: Electricity and
Magnetism
• Electromagnetic Induction
• Circuits and Power Quiz tomorrow
• Outline Chp. 14 pg 235-245• Review Questions 1-17
• Pick up and complete Crossword Puzzle
Electric Currents, Magnetic Fields
May 7, 2012
Objectives
1. Describe the magnetic field produced by a current-carrying wire
2. Give examples of how the field can be made stronger
We KNOW
Electric wire can be made to have a current
Magnet has a magnetic field surrounding it
Interaction An electric current produces a magnetic field Magnetic field makes up a pattern of circles
When the current is reversed the direction of the magnetic field is also reversed
If a current carrying wire is looped the magnetic field is intensified
More loops means greater magnetic field
Electromagnets
If a piece of iron is placed in a current-carrying coil of wire, the iron will become a magnet – electromagnet (temporary magnet)
Roller coasters Junk yards Electric trains
Magnetic Forces on Wires
If an electric current can produce a magnetic field
Then, we can use a magnetic field to change an electric current
We can use the combination of both to create a motor