Which one of the following devices is used to detect electric charge on an object?
Seismograph
Seismometre
Richter scale
Electroscope
The device used for detecting charge (positive or negative) on an object is called:
(a) stethoscope (b) telescope (c) kaleidoscope (d) electroscope
Electroscope is an instrument which is used to detect the charge on a body. What is "A” in the following diagram shown below?