Definition

1. Noun:
   • A scientific instrument for detecting electric charge: An electroscope is a device used to measure the presence and magnitude of electric charge. Its classic form uses two thin metal leaves (often gold) that separate or diverge when they acquire a like charge, demonstrating electrostatic repulsion.

Examples of Usage

• Noun:
  • The scientist used an electroscope to demonstrate the presence of static electricity.
  • In the physics lab, we observed how the leaves of the electroscope diverged when a charged rod was brought near.
  • A simple electroscope can be made with a jar, a metal rod, and two strips of thin foil.

Advanced Usage

• "Gold-leaf electroscope": This is the most traditional and common type, specifically using thin gold leaves for maximum sensitivity and flexibility.
  • The gold-leaf electroscope is a classic apparatus for teaching electrostatics.

Variants and Related Words

• Electrometric (adj): Pertaining to the measurement of electrical quantities.
  • Electrometric techniques are more precise than a simple electroscope.
• Electrostatic (adj): Relating to stationary electric charges or fields as opposed to electric currents.
  • The electroscope is a fundamental tool for studying electrostatic phenomena.

Synonyms

• Charge detector: A descriptive term for an instrument that indicates the presence of electric charge.
• Electrometer: A more general term for instruments that measure electric charge or potential difference; an electroscope is a simple type of electrometer.

Related Phrases

(Note: As a specific scientific instrument, "electroscope" does not commonly form phrasal verbs or idioms in everyday language. Its usage is primarily technical.)

Noun

1. measuring instrument that detects electric charge; two gold leaves diverge owing to repulsion of charges with like sign