Question

explain work of electroscope

Answer 1

Electroscopes detect electric charge by the motion of a test object due to the Coulomb electrostatic force. Since the electric potentialor voltage of an object with respect to ground equals its charge divided by its capacitance to ground, an electroscope can be regarded as a crude voltmeter. However, the accumulation of enough charge to detect with an electroscope requires hundreds or thousands of volts, so electroscopes are only used with high-voltage sources such as static electricityand electrostatic machines. Electroscopes generally give only a rough, qualitative indication of the magnitude of the charge. An instrument that measures chargequantitatively is called an electrometer.

Answer 2

ELECTROSCOPE : Electroscope is used to detect and measure electric charges.

WORKING OF AN ELECTROSCOPE :

•In an uncharged electroscope, the leaves hang straight down.

•When a charged object touches the metal knob, electric charges travel down the rod and into the leaves.

•The leaves spread apart, indicating the presence of an electric charge.

•Since the charge on both leaves is the same the leaves repel each other and spread out.

CONSTRUCTION OF AN ELECTROSCOPE :

An electroscope consists of a metal rod with a knob at the top and a pair of thin metal leaves at the bottom. The rod is inserted in a one hole rubber stopper which fits into a flask.The flask contains the lower part of the rod and the metal leaves.