Introduction
Carbon is a more electronegative element than hydrogen, which means that it has a greater tendency to attract electrons towards itself. However, when carbon loses an electron to form a carbocation, it has a positive charge on it. This may seem counterintuitive, but it can be explained by understanding the nature of carbocations.

What is a carbocation?
A carbocation is an ion that contains a positively charged carbon atom. It is formed when a molecule loses an electron, leaving behind a positively charged ion. Carbocations are highly reactive and are involved in many organic chemical reactions.

Why does carbon have a positive charge?
When a molecule loses an electron, it becomes positively charged. In the case of a carbocation, the carbon atom loses one of its valence electrons, leaving it with only three electrons in its outer shell. This creates a positively charged ion, as the number of protons in the nucleus is greater than the number of electrons.

Why is carbon more electronegative than hydrogen?
Electronegativity is a measure of an atom's ability to attract electrons towards itself. Carbon has a higher electronegativity than hydrogen because it has a greater nuclear charge and a smaller atomic radius. This means that carbon has a greater pull on the electrons in a molecule than hydrogen does.

Conclusion
In conclusion, while carbon is more electronegative than hydrogen, it can still have a positive charge when it forms a carbocation. This is because the loss of an electron from carbon creates a positively charged ion, regardless of its electronegativity.