Determine the direction of the electron flow in the ammeter in Diagram III that causes the balance pan to return to its original position. Explain how you determined the direction of electron flow.
Determine the direction of the electron flow in the ammeter in Diagram III that causes the balance pan to return to its original position. Explain how you determined the direction of electron flow.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Transcribed Image Text:Determine the direction of the electron flow in the ammeter in Diagram III that causes
the balance pan to return to its original position. Explain how you determined the
direction of electron flow.
Transcribed Image Text:Description of the Operation of an Electronic Scale
Diagram I: No object on the scale pan
Light detector
Balance pan
LED
Coil.
Control
unit
Cylindrical-
magnet
Diagram II: An object is placed on the scale pan
Object of
unknown-
mass
Light reaches
detector
LED
Control
unit
Diagram III: Measurement of current to determine mass
Light blocked
by shield
Control
unit
A shield blocks light from the LED, preventing it from
reaching the light detector. The control unit does not
supply current to the coil.
The weight of the object moves the pan downward. As
a result, the shield moves down and light from the LED
reaches the light detector. The presence of light on the
light detector signals the control unit to supply current
to the coil.
The current in the coil induces a magnetic field. The
interaction of this field with that of the permanent magnet
forces the pan upward. The control unit increases the current
until the shield is high enough to block the light from the
LED. The control unit then determines the current required
to keep the pan at this fixed height. The measurement of this
current is used to determine the mass of the object.
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