Describe the contributions of hans christian oersted to our inderstanding of magnetism and electricity

here are the choices

Explanation:

He discovered electromagnetic induction after seeing a compass needle deflected by a flowing electric current.

He discovered electromagnetism after seeing a compass needle deflected by a flowing electric current.

He discovered electromagnetic induction after seeing a changing magnetic field generate an electric current.

He discovered electromagnetism after seeing a changing magnetic field generate an electric current.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.