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INDEX E2 : MAGNETISM

E2.01 EARTH'S MAGNETIC FIELD

Use compass needle and dip needle to show direction of Earth's magnetic field.

E2.02 PARALLEL WIRES

Shows the magnetic attraction/repulsion of currents flowing in two parallel wires.

E2.03 OERSTED'S EXPERIMENT

Shows the effect of a current carrying wire on a compass needle.

E2.04 MAGNETIC FIELD FROM A CURRENT

Overhead projection boxes with different wiring configurations. Iron filings show the magnetic fields.

E2.05 REVERSING THE POLES

A compass needle shows the polarity of a bar magnet. The magnet is then demagnetized and remagnetized with its poles reversed. The compass needle shows the change.

E2.06 HANGING COIL IN A MAGNETIC FIELD

A coil is suspended in a uniform magnetic field. When current is passed through the hanging coil, it rotates.

E2.07 BARKHAUSEN EFFECT

Two bar magnets rotate about a coil holding an iron core, and one can hear the alignment and realignment of the magnetic domains within the iron.

E2.08 MAGNETIC ACCELERATOR

Electromagnets are mounted around the air track, and a bar magnet is fastened to a car. By reversing the electromagnet while the car is inside the field, the car can be accelerated.

E2.09 MAGNETIC FIELD OF A LARGE SOLENOID

A suspended bar magnet is used to show the magnitude and direction of the field due to a large solenoid.

E2.10 DIAMAGNETISM & PARAMAGNETISM

Shows the direction of the forces on diamagnetic and paramagnetic materials in an inhomogeneous field.

E2.11 WALKING THE PAPER CLIP

A paper clip suspended from a thread traces the magnetic field of a horseshoe magnet.

E2.12 OHP MAGNETIC FIELD LINES

Iron filings trace the magnetic field around various combinations of magnets: like poles, opposite poles, bar magnet, horseshoe magnet.

E2.13 CURRENT BALANCE

A current balance measures the magnetic force between two wires.

E2.14 HELMHOLTZ BICYCLE WHEELS

Two bicycle wheels wrapped with wire serve as large Helmholtz coils.

E2.15 PICKING UP NAILS WITH A SOLENOID

Inserting an iron core greatly improves a solenoid's performance as an electromagnet.

E2.16 SPATULA IN MAGNET

A flat bladed spatula is removed from between two horseshoe magnets with the blade parallel and then perpendicular to the magnet faces.

E2.17 CURIE POINT

When heated, a wire coil loses its magnetic properties but regains them upon cooling.

E2.18 OHP COMPASS NEEDLES

An array of small compass needles to show magnetic fields on the overhead projector.

E2.19 FLOATING MAGNETS

Doughnut shaped magnets are oriented so that their poles repell and are placed over a post. The top magnet floats freely.

E2.20 MAGNETIC LEVITATION

A ceramic magnet is made to levitate above a rotating conducting disk by eddy currents induced in the disk.

E2.21 LEVITRON

A magnetic top levitates. WARNING: Requires practice to perform well.

E2.22 NEWTON'S FOLLY

A steel ball levitates.

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