A deflected needle signifies that the electric current flowing through the copper wire has generated a magnetic effect.

The deflection of the needle demonstrates the interconnection between electricity and magnetism, indicating that these two phenomena are linked.

Hans Christian Oersted accidentally discovered that a compass needle deflected when an electric current passed through a nearby metallic wire.

Oersted demonstrated that electricity and magnetism are related phenomena, providing a crucial foundation for understanding electromagnetism.

Non-biodegradable substances are materials that cannot be broken down by biological processes. They may persist in the environment for a long time, potentially causing harm to various members of the ecosystem due to their inert or toxic nature.