Question

105. The existence of electric charges can be
detected by
1) microscope
2) telescope
3) pith-ball electroscope
4) spectrometer
​

Answer 1

Hey mate your answer is

pith - ball electroscope

because microscope is used for seeing microorganisms , telescope is used to see stars

And spectrometer is used to measure spectral measures of phenomenon

I hope you have got your answer