What rule can be used to determine the direction of magnetic flux lines if the direction of current in a conductor is known?

The rule that determines the direction of magnetic flux lines based on the direction of current in a conductor is known as the Right Hand Rule. This rule states that if you point the thumb of your right hand in the direction of the current flow, your fingers will curl in the direction of the magnetic field lines created around the conductor. This concept is fundamental in understanding the relationship between electricity and magnetism.

Other options, such as Ohm's Law and Faraday's Law, pertain to different principles in electrical theory. Ohm's Law deals with the relationship between voltage, current, and resistance, while Faraday's Law relates to electromagnetic induction, describing how a changing magnetic field can induce an electric current. The Left Hand Rule is typically used for motors, where it helps visualize the direction of force exerted on a conductor within a magnetic field, but it does not directly apply to determining the direction of magnetic flux based on current flow itself.