Magnetism Summary Sheet PDF

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Current topic:

Magnetism

Chapters Text Book:

Chapter 22.1-22.5 22.7-22.10

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Name 22.1 Magnets

*Describe IYOW Magnets very in shape, size, and strength but they all have a N and S pole

Concepts Summary: Magnets will attract any object that consist of iron

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22.2 Ferromagnets and Electromagnets

Depending on which poles of the magnets meet will determine whether they will repel or attract each other The word ferromagnetic derives from word ferrum, which is iron in Latin Magnetics with strong magnetic effects contain iron, cobalt, nickel, and gadolinium Electromagnets are made from electrical currents and are temporarily induced

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22.3 Magnetic Fields and Magnetic Field Lines

The possibilities of objects that use electromagnetism are endless Magnetic fields represent magnetic forces, and is called the B-field Magnetic field lines help show the strength and direction of the field The direction is defined to be the direction in which the north end of a compass needle points

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22.4 Magnetic Field Strength

Magnetic fields exert force on moving charges, and so they exert forces on other magnets, all of which have moving charges F = qvB sin θ

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22.5 Force on a Moving Charge in a Magnetic Field 22.6 The Hall Effect

F = magnetic force q = speed v = magnetic field B = strength Forces can move in a circular or spiral path Magnetic force is perpendicular to velocity, so kinetic energy and speed remains constant The Hall Effect is the creation of a voltage across a current-carrying conductor by a magnetic field It determines whether the positive or

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22.7 Magnetic Force on a CurrentCarrying Conductor

negative charges carries the current Charges cannot escape a conductor; the charges are transmitted to the conductor itself The magnetic field exerts a force in the same direction as that on individual moving charges Expressions for magnetic forces on a current by taking a sum of the magnetic forces

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22.8 Torque on a Current Loop: Motors and Meters

Motors are the most common application of magnetic force on wires When current is passed through the loops, the field exerts torque on the loops, which rotates the shaft Electrical energy is converted to mechanical work

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22.9 Magnetic Fields Produced by Currents: Ampere’s Law

22.10 Magnetic Force between Two Parallel Conductors

Torque is proportional to electric current, not angular position Ampere’s Law relates magnetic field and current One ampere of current through each of two parallel conductors of infinite length, separated by one meter in empty space free of other magnetic fields, causes a force of exactly 2×10−7 N/m on each conductor The force between the parallel conductors is attractive when the currents are in the same direction. A similar analysis shows that the force is repulsive between currents in opposite directions.

Problems Worked:

1-6, 11, 12, 17

**Context Summary:

Magnets happen to be, in my opinion, the most diverse and unique creations from physics. Magnetism can be looked at in so many ways!!!...