What happens whenever a net force acts on an object?

If the net force acting on an object is zero, then it means that the object's velocity is constant and the object isn't speeding up or slowing down. That is, there is no acceleration on an object with zero net force.

2. An electric current in a conductor creates a magnetic field at all points in the surrounding region.
3. A permanent magnet creates a magnetic field at all points in the surrounding region.
4. A moving electric charge creates a magnetic field at all points in the surrounding region.