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OPERATING INSTRUCTIONS
F
B
ORCE
ETWEEN
Force Between Conductors KSCIFBCD
1
2
3
DESCRIPTION
A basic property of electromagnetism is the mechanical force which exists between two
neighboring, current-carrying conductors. This was first observed by Oersted in June of
1820 and was rapidly investigated by him as well as by Ampère, Biot and Savart, so that
the theory was developed by the end of the same year. The unit of current, the Ampère,
is defined in terms of this force. However, observing the small force with simple
conductors requires large currents. The Force between Conductors Demonstrator offers
a simple, direct method for accomplishing this usually difficult and often unsatisfying
Demonstration. The device consists of a metal frame (1, Figure 1), which supports two
long straight conductors that can pivot about vertical axes (2). The base of the frame
(3) contains a power supply to energize the conductors. Binding posts (4) allow voltage
to be applied to the conductors in various configurations. A pushbutton (5) applies the
voltage, allowing a large current to flow momentarily in the conductors. Two adjustable
indicator arrows (6) show the direction of the current in each conductor. The movement
of the conductors indicates the generation of a magnetic force between them.
847-336-7556
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AND SUGGESTED ACTIVITIES
C
ONDUCTORS
FBCD01
Figure 1
www.KlingerScientific.com
D
EMONSTRATOR
4
6
5
4
1
1
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Table of Contents
Related Manuals for KLINGER KSCIFBCD
Summary of Contents for KLINGER KSCIFBCD
- Page 1 AND SUGGESTED ACTIVITIES ORCE ETWEEN ONDUCTORS EMONSTRATOR Force Between Conductors KSCIFBCD FBCD01 Figure 1 DESCRIPTION A basic property of electromagnetism is the mechanical force which exists between two neighboring, current-carrying conductors. This was first observed by Oersted in June of 1820 and was rapidly investigated by him as well as by Ampère, Biot and Savart, so that...
- Page 2 SPECIFICATIONS Conductors: Thin wall brass tubes with copper end pieces Length: 39.5 cm Diameter: 4.4 mm Lever arm: 2.5 cm Cold resistance (each): Approx. 0.013Ω Power: Input: 110VAC/60Hz, 345W (max., - operate for < 5 seconds) Output: Open circuit voltage 4.0V d.c., operating voltage 0.5—1.5 V d.c. Approx.
- Page 3 The magnetic field H is related to the induction B in free space by the equation: B = μ It turns out that μ is the same constant discovered in equation (1), so by substitution = (i /4πr ).(ds which is the well-known Biot-Savart Law for the magnetic field of a current element. Note that the strength of the field falls off as the inverse square of the distance from the element.
- Page 4 Demonstration Position the conductors so that the lever arms are approximately parallel. · Keeping the hands well away from the conductors and contacts, press and hold the red pushbutton. The green indicator light between the two binding posts on the top of the base will illuminate to indicate that voltage is applied, and the conductors will immediately move either together or apart, depending on the mutual directions of the currents in each.
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