Question

Is magnetic force perpendicular to current?

Answer 1

1. According to the right-hand rule, the magnetic force on a current-carrying wire is perpendicular to both the wire and the magnetic field.
2. Move your fingers along a vector $B$ while rotating a vector $I$. Then the thumb is pointing towards the force in the direction of $F$. Force applied to a straight wire of $L$-length.

$\overrightarrow{F}=\overrightarrow{I}L\times \overrightarrow{B}$

3. Fleming's Right-Hand Rule: If we arrange our right hand's thumb, forefinger, and middle finger perpendicular to one another, the thumb will point in the direction of the magnetic force, the forefinger will point in the direction of the magnetic field, and the middle finger will point in the direction of the current.

4. The force is at its lowest when the current is perpendicular to the magnetic field lines and at its highest when it is parallel to those lines.