How does a magnetic field affect a moving electric charge?

When an electric charge moves through a magnetic field, it experiences a force that can change its direction. This force acts perpendicular to both the direction of the charge's motion and the magnetic field. It doesn't speed up or slow down the charge but causes it to move in a curved path. This behavior is used in many practical devices like particle accelerators and cathode-ray tubes. It also explains natural phenomena like the auroras near Earth's poles. The interaction shows how magnetic fields can influence electrical behavior without direct contact.