Devices that can identify positive vs. negative charge

Lincoln, James

doi:10.1119/1.5003753

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…Therefore, by comparing the electric charge with another known object, we try to understand the type of charge. Several ideas have been published to detect the polarity of the electrical charge [4][5][6][7]. It has been shown that electronic electroscopes with different designs and which are made of inexpensive materials will be used effectively to determine the polarity of the charge [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

An electronic electroscope for determining polarity of charge

Yavaş¹,

KARADAĞ²

2019

Phys. Educ.

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In this study, we made a simple electronic electroscope called a 'polarity detector' which can determine the type of electric charge on any objects. We used the polarity detector in some student experiments in the physics laboratory. For example, when we applied a plastic rod to a piece of fabric made of wool, we could easily determine that the plastic rod was electrified with a negative electrical charge using the polarity detector. Similarly, we could show that a glass rod applied to a piece of silk fabric was electrified with a positive type of charge. However, when we carried out the same experiments with a metal leaf electroscope instead of the polarity detector, in both cases, the leaves of the electroscope were opened and gave the same response for plastic and glass rods. Thus, the electroscope with a metal leaf does not provide an idea of the type of electric charge on plastic or glass rods. Although this tool is made of cheap materials and is very simple, we have seen that it works quite well in the laboratory and contributes to the easy learning of static electricity. Therefore, we think it would be useful to use this simple instrument in the physics laboratory as an aid to metal-leaf electroscopy.

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Section: Introductionmentioning

confidence: 99%

An electronic electroscope for determining polarity of charge

Yavaş¹,

KARADAĞ²

2019

Phys. Educ.

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Using Capacitors to Measure Charge in Electrostatic Experiments

Vera

Ortíz

Romero-Maltrana

et al. 2018

The Physics Teacher

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In this work we describe a simple setup for measuring electrostatic charge and polarity in electrostatic experiments. This low-cost detector only requires a graphite pencil, a capacitor, two switches, and a voltmeter, and holds the promise of transforming qualitative activities that are commonly used to teach electrostatics into quantitative activities. In order to measure the charge and polarity of charged objects, a pencil is used as an antenna to collect charge from the object under study. The collected charge is transferred to a capacitor, and the resulting voltage at the capacitor is measured using a voltmeter. In contrast to other devices, our detector can be used to measure the amount of charge stored in objects at several thousand volts, as for example Van de Graaff domes.

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X-rays in the classroom

Lincoln¹,

Barrueto-Cabello

2021

The Physics Teacher

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X-rays are such an important and familiar part of the electromagnetic spectrum, but is there a way to safely bring x-rays into your lecture? The demo team at the University of California at Berkeley seems to have managed this. They have an x-ray safe box that they use to produce a live x-ray image on a fluorescent screen. In this article, we describe the apparatus, provide an overview of how x-rays are produced, and explain the strategies the Berkeley team used to ensure that this demonstration is safe for everyone involved.

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Devices that can identify positive vs. negative charge

Cited by 5 publications

References 6 publications

An electronic electroscope for determining polarity of charge

An electronic electroscope for determining polarity of charge

Using Capacitors to Measure Charge in Electrostatic Experiments

X-rays in the classroom

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