Explanation:

When a negatively charged conductor is connected to earth, electrons flow from the conductor to the earth. This is because the earth is a large reservoir of electrons, and it is at a potential of zero volts. The negative charge on the conductor is attracted to the positive charge of the earth, and electrons flow from the conductor to the earth until the potential of the conductor is equal to the potential of the earth. This process is called grounding.

To understand this process, we need to know a few basic concepts:

- Charge: Charge is a fundamental property of matter. It can be positive or negative. Like charges repel each other, and opposite charges attract each other.
- Conductor: A conductor is a material that allows the flow of charge through it.
- Potential: Potential is a measure of the energy per unit charge. It is usually measured in volts.

Now, let's see why electrons flow from the conductor to the earth when they are connected:

- The negatively charged conductor has an excess of electrons, which repel each other and try to move away from each other.
- When the conductor is connected to earth, the excess electrons on the conductor are attracted to the positive charge of the earth. This attraction creates a flow of electrons from the conductor to the earth.
- As electrons flow from the conductor to the earth, the potential of the conductor decreases, and the potential of the earth increases.
- The flow of electrons continues until the potential of the conductor is equal to the potential of the earth. At this point, the flow of electrons stops, and the conductor is said to be grounded.

In summary, when a negatively charged conductor is connected to earth, electrons flow from the conductor to the earth until the potential of the conductor is equal to the potential of the earth. This process is called grounding, and it is important in many electrical applications to prevent electric shocks and damage to equipment.