Why gravitational force of attraction is necessary for a satellite to revolve around earth?

The question was posted by Raj Kumar. The satellite has a velocity. To revolve around, the direction of velocity must change. In the absence of a force it can move only in a straight line. It is the gravitational force which helps the satellite top change direction and revolve around the earth. In other words, for a [...]

Electrostatics : A Practice Test Paper – 1

Time: 45 min Max. Marks: 25 How does the force between two point charges change, if the dielectric constant of the medium in which they are kept, increases? [1] Name the experiment which established the quantum nature of electric charge. [1] Ordinary rubber is an insulator, but the special tyres of aircrafts are made slightly conducting. Why … Continue reading Electrostatics : A Practice Test Paper – 1