In the Left-Hand Rule for Conductors, the thumb indicates the direction of the current, and the encircling fingers indicate the direction of the ?

In the Left-Hand Rule for Conductors, the thumb indicates the direction of the current, and the encircling fingers indicate the direction of the ?

• A. Current
• B. Magnetic field
• C. Resistance
• D. Voltage

Answer: (B)

The fact being tested is how the magnetic field around a current-carrying conductor is oriented. When you align your left hand so the thumb points in the direction of the current, the way your fingers wrap around the conductor traces the magnetic field lines that circle the wire. In other words, the encircling fingers show the direction of the magnetic field immediately surrounding the conductor. This circular field is a direct result of the moving charges, and recognizing it helps you visualize forces and interactions in devices like motors and sensors. The other quantities—current direction is shown by the thumb, while resistance and voltage are not described by the way your fingers encircle the wire.

The fact being tested is how the magnetic field around a current-carrying conductor is oriented. When you align your left hand so the thumb points in the direction of the current, the way your fingers wrap around the conductor traces the magnetic field lines that circle the wire. In other words, the encircling fingers show the direction of the magnetic field immediately surrounding the conductor. This circular field is a direct result of the moving charges, and recognizing it helps you visualize forces and interactions in devices like motors and sensors. The other quantities—current direction is shown by the thumb, while resistance and voltage are not described by the way your fingers encircle the wire.