Correct Answer - Option 3 : Electroscope
Correct option-3
Concept:
- Electric charge is the basic physical property of matter that causes it to experience a force when kept in an electric or magnetic field.
- An electric charge is associated with an electric field and the moving electric charge generates a magnetic field.
- A combination of electric and magnetic fields is known as the electromagnetic field.
- Interaction of the charges generates an electromagnetic force which is the foundation of Physics.
The two types of electric charges are:
1. Positive
2. Negative
Explanation:
- An electroscope is a device that is used to detect the presence of an electric charge on an object.
- It was invented In the year 1600 by British physician William Gilbert.
- The working principle of an electroscope is based on the atomic structure of elements, charge induction,
- The internal structure of metal elements and the idea that like charges repel each other while unlike charges attract each other.
- The electroscope detects the charge based on the Coulomb electrostatic force which causes the motion of the test charge.
- An instrument that is used to measure the charge quantitatively is known as an electrometer.
Hence, option-3 is correct
