The magnetic field around a current-carrying wire was discovered by:

The discovery of the relationship between electricity and magnetism occurred in 1820 by the Danish physicist **Hans Christian Ørsted**. 1. **The Observation**: During a lecture, Ørsted noticed that a compass needle deflected when it was placed near a wire carrying an electric current. 2. **The Conclusion**: Since a compass needle responds to magnetic fields, the deflection proved that the electric current flowing through the wire created a magnetic field in the surrounding space. 3. **Significance**: This was the first evidence of **electromagnetism**, linking two previously separate branches of physics. This discovery paved the way for the work of Ampère and Faraday. Other scientists in the options: - **Faraday** discovered electromagnetic induction. - **Newton** developed the laws of motion and gravitation. - **Volta** invented the first chemical battery.