Is magnetism involved in gravity

Answer 1

No. Magnetism is a part of the electromagnetic force, while gravity is a completely different force all together. The gravitational field of the Earth for example is not caused by the Earth's magnetic field.

A certain model of the Universe proposed in the past, called the Kaluza-Klein theory, however, does contain some link between the two forces. Kaluza and Klein showed that a Universe with five dimensions (instead of four) and gravity would automatically have a electromagnetic force if the extra dimension was curled up.

Nowadays, because of the emergence of two additional forces of nature, the Kaluza-Klein theory is not used anymore. The new model, called the Standard Model does borrow a few things from Kaluza-Klein, but the extra dimensions in the Standard Model are so-called internal dimensions and are not equivalent to the four other ones.

String Theory is somewhat of a successor to Kaluza-Klein, it too proposes additional curled-up dimensions, although more than one, and they are curled up in what is known as a Calabi-Yau shape.