electroscope
/ɪˈlɛktrəˌskoʊp/
noun
- A scientific instrument used to detect the presence and amount of electric charge.
- An electroscope can show whether an object has a positive or negative electric charge.
- The electroscope's gold leaves moved apart when he brought the charged balloon near it.
- In science class, we used an electroscope to see if the plastic rod was charged.
Synonyms