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Current Balance, External
If a conductor, usually a wire, carries a current and
is placed in a magnetic field, it experiences a small
force. Electric motors are a good example where such
a force occurs. To measure this small force you need a
very sensitive balance—like this one! This unit’s design
assures highly accurate measurement of these small
forces. Force vs. current or force vs. conductor distance
can be determined easily. A series of built-in multi-turn
coils can be utilized for multiple runs of the experiments.
Includes two 1-ohm, 25-W resistors for current limiting, instructions for assembly and
experiments. Requires two DC power supplies capable of delivering 5 A.
Catalog No. Description Price/Each
AP5630 Current Balance, External $212.00
Orion Science Current
Balance Kit
This high-quality current balance from Orion
Science lets student investigate the forces acting
on a current-carrying wire. Current, wire lengths,
magnetic field and coil angles all can be adjusted.
Catalog No. Description Price/Each
AP10977 Orion Science Current Balance Kit $780.00
Electromagnet Kit
Use this economical kit to teach all the basics of
electromagnetism. Students can build a bar magnet
or a U-shaped electromagnet. Measure the polarity
and magnitude of electromagnetic forces. The kit
includes two coils on plastic spools, a U-shape iron
core, two magnetic needles with stands and a pair
of easy-connect wires. Comes in a plastic storage
case and an activity manual is included.
Catalog No. Description Price/Each
AP5728 Electromagnet Kit $33.85
ELECTRICITY AND MAGNETISM—ELECTROMAGNETISM continued on next page.
Electricity and Magnetism—
Electromagnetism
PHYSICS & PHYSICAL SCIENCE ELECTRICITY AND MAGNETISM
Eddy Currents—
Demonstration Kit
By: The Flinn Staff
Drop a nonmagnetic cylinder down a two-foot long metal
tube and watch it fall through the bottom in less than a
second. Next drop a similar-looking magnetic cylinder down
the same tube. Students will be amazed as they impatiently
wait for several seconds before this cylinder finally emerges
out of the bottom. Students discover
that it’s not friction that
slows the cylinder down—it’s Lenz’s law in action! As the
magnetic cylinder falls through the metal tube, electrical
(eddy) currents in the tube produce their own magnetic field
that repels the magnetic field of the falling magnet, causing
it to slow down and fall at a constant speed. Comes complete
with instructions and discussion of eddy currents.
Tube
comes with end caps to make storage of the cylinders a snap.
Concepts: Eddy currents, Lenz’s law, magnetism.
Time Required: 10 minutes
Materials Provided: Aluminum tube with end caps, sheathed nonmagnetic and
magnetic cylinders.
Catalog No. Description Price/Each
AP4698 Eddy Currents—Demonstration Kit $25.60
Force Between Conductors Demonstrator
Demonstrate a basic property of electromagnetism in a safe and
easy to-use device. Force Between Conductors Demonstrator
consists of a metal frame that supports two long, straight conductors.
A pushbutton applies a voltage, momentarily producing a
large current in the conductors. The conductors are able to rotate
freely about the vertical axis to show attraction or repulsion due
to the mechanical force between them. Voltage can be applied
in various configurations: series or parallel, and same sense or
opposite sense. Simply connect the heavy duty cords to the appropriate
binding posts. Indicator arrows can be adjusted to show the
direction of current in each conductor. Students will be fascinated
watching the conductors attract and repel due to the induced magnetic fields. This
simple, direct method demonstration will allow your students to observe first-hand
this electromagnetic phenomenon. Operates at 110 VAC.
Catalog No. Description Price/Each
AP8165 Force Between Conductors Demonstrator $161.00
LaPlace’s Law Demonstrator
A magnetic field is generated by a current-carrying
wire. Verify the existence of this magnetic field
with the LaPlace’s Law Demonstrator. A U-shaped
magnet is placed between two separate parallel
conductors. Then a rod with a disc is placed across
the conductors. This creates a complete conducting path. When a current is passed
through the parallel conductors, a force acts on the rod with the disc causing it to
roll. 8" L x 5" W x 33/4" H.
Catalog No. Description Price/Each
AP7867 LaPlace’s Law Demonstrator $39.65
Tangent Galvanometer
Investigate magnetic fields produced by
an electric current. Students observe as
a current carrying coiled wire produces a
magnetic field perpendicular to the direction
of the current. Students learn that the
strength of the magnetic field varies with
the number of times the wire is coiled.
Complete instructions provided.
Catalog No. Description Price/Each
AP9230 Tangent Galvanometer $67.65
Zeeman Effect
Apparatus
The Zeeman Effect Apparatus examines
the effect of a strong magnetic
field on the green emission line of
mercury at 545.1 nm wavelength. Full
details at flinnsci.com.
Catalog No. Description Price/Each
AP8154 Zeeman Effect Apparatus $9680.00
Electromagnet
What can lift 100 times its own weight? Answer: This
electromagnet! Lift up to 200 pounds using one 1.5 V
D-cell battery! The battery is conveniently held in a
battery clip on top of the magnet and alligator clips
make completing the circuit easy.
Catalog No. Description Price/Each
AP5637 Electromagnet $69.75
Gilley Coil Kit
Use the modular pieces to perform experiments
in magnetic induction, primary and
secondary coil transformers, effects of current
direction and distance on magnetic lines of
force, and effects of electromagnetic polarity
between two coils. Background and directions
are provided. Requires a 6-V dry cell, sold
separately.
Catalog No. Description Price/Each
AP5654 Gilley Coil Kit $60.70
AP1429 Battery, 6.0-V 15.50
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