Which finger shows the direction of current in Fleming’s left hand rule?

Middle finger

The correct answer is option 2. Middle finger.

Fleming's left-hand rule is a mnemonic device used in electromagnetism to determine the direction of motion of a conductor carrying an electric current in a magnetic field. It applies to situations where the conductor, magnetic field, and current are mutually perpendicular.

Here's how it works:

The thumb, index finger, and middle finger of your left hand are positioned perpendicular to each other.

The index finger points in the direction of the magnetic field (B).

The middle finger points in the direction of the electric current (I).

The thumb then indicates the direction of the force (F) acting on the conductor due to the interaction of the current and the magnetic field.

So, if you know the directions of the magnetic field and the electric current, you can use Fleming's left-hand rule to determine the direction of the resulting force on the conductor.