The relationship between magnetism and an electric current was discovered by .
a. newton
b. oersted
c. einstein
d. franklin

The answer is letter B.

Orsted or Hans Christian Oersted discovered the relationship between electric currents and magnetism. He was a Danish physicist and chemist that discovered magnetic fields created by electric currents, known as the Oersted’s Law. It is one of the important aspects of electromagnetism and contributed to the advances in science throughout the late 19th century. He is known to have founded many societies and organizations that disseminated knowledge of natural sciences in society. He is one of the first modern thinkers that explicitly described and named the thought experiment.