RHR1: Determines the direction of the magnetic field around a current-carrying wire. Thumb points in current direction, fingers curl in field direction. | RHR2: Determines the direction of the force on a current-carrying wire in a magnetic field. Fingers point in current direction, palm faces magnetic field, thumb points in force direction.

Magnetic Field Strength: Depends on current (I) and distance (r). $B=\frac{\mu_{0}}{2 \pi} \frac{I}{r}$. | Magnetic Force: Depends on current (I), length ($\ell$), magnetic field (B), and angle ($\theta$). $F_{B}=I \ell B \sin \theta$.

The magnitude of the magnetic field at a point in space, measured in Teslas (T).

A physical constant that relates the amount of current to the strength of the magnetic field produced; $\mu_0 = 4\pi × 10^{-7} T⋅m/A$.

The rate of flow of electric charge, measured in Amperes (A).

A magnetic field generated by a source separate from the current-carrying wire being considered.

The force exerted on a current-carrying wire when it is placed in a magnetic field, measured in Newtons (N).

Increasing the current increases the strength of the magnetic field (directly proportional).

Increasing the distance decreases the strength of the magnetic field (inversely proportional).

The magnetic force on the wire is zero because $\sin(0) = 0$ in the formula $F_{B}=I \ell B \sin \theta$.

The force is maximum when the angle is 90 degrees (perpendicular) and zero when the angle is 0 or 180 degrees (parallel or anti-parallel).

The wires experience an attractive force towards each other.

The wires experience a repulsive force away from each other.