Q:

How does an electroscope work?

A:

An electroscope detects electric charges by charging and discharging two strips of gold leaf. The two strips of gold leaf are suspended from a metal rod in a glass jar.

Know More

Full Answer

The suspended strips and the metal rod are able to conduct electricity. The metal rod passes through the jar with a stopper that is not capable of conducting electricity. When a charged object is brought near the metal rod, both strips repel each other and resemble an inverted V. The strips repel each other because they have acquired a like charge. When the strips have a like charge and separate, the electroscope becomes charged. If an object with the opposing charge is brought near the metal rod, the strips of gold leaf will hang straight down. The strips no longer repel each other because the charge has been neutralized. After neutralization, the electroscope becomes discharged. Electroscopes are commonly used in laboratories and industries for experiments and measuring electric currents. Electroscopes can also be used to detect various types of radiation from radioactive material. The electroscope, the first electrical measuring instrument, was invented by British physician William Gilbert. The pith-ball and the gold-leaf electroscopes are the most commonly used simple electroscopes.

Learn more in Optics & Waves

Related Questions

  • Q:

    How does a spectrometer work?

    A:

    Spectrometers work by passing radiation through a sample to detect a unique spectrum for that sample. The resulting spectrum can be used to identify molecules, functional groups and substances within the sample.

    Full Answer >
    Filed Under:
  • Q:

    How does sound work?

    A:

    Scientifically speaking, sounds are vibrations that spread as an audible mechanical wave through a medium of air or water. The hearing organs are then stimulated by the vibrations.

    Full Answer >
    Filed Under:
  • Q:

    How do sound waves work?

    A:

    Sound occurs as a result of the back-and-forth vibration of sound waves travelling across a medium. A sound wave is sometimes referred to as a pressure wave because it contains repeating patterns of high-pressure and low-pressure regions.

    Full Answer >
    Filed Under:
  • Q:

    How does night vision work?

    A:

    Night vision works differently depending upon the type of night vision being employed. Low-light imaging, thermal imaging and near infrared imaging are all types of night vision currently in use as of 2014.

    Full Answer >
    Filed Under:

Explore