how is a magnetic field produced ?
a. when an object has an electric charge
b. when an electromagnetic field interacts with a magnet
c. when electrons move through a circuit
d. when a current runs through a conductor
All of the given options can produce a magnetic field.
a. When an object has an electric charge, it creates an electric field. If the charge is in motion, it also generates a magnetic field.
b. When an electromagnetic field interacts with a magnet, the motion of the charged particles generates a magnetic field.
c. When electrons move through a circuit, they create a current, which produces a magnetic field.
d. When a current runs through a conductor, it generates a magnetic field.