Which statement describes the right-hand rule for determining the direction of the magnetic field around a straight current-carrying conductor?

Which statement describes the right-hand rule for determining the direction of the magnetic field around a straight current-carrying conductor?

• A. Curl fingers around the conductor with the thumb along the current; the magnetic field direction is given by the curled fingers.
• B. Place the thumb in the direction of the magnetic field to determine the current direction.
• C. The magnetic field direction is perpendicular to the wire's length.
• D. The magnetic field direction is always opposite to the current.

Answer: (D)