**The Left Hand Rule **

It is well known that a current carrying conductor in a magnetic field experiences a forced. Fleming's Left Hand Rule enables us to calculate the direction of the force. This is illustrated below.

In this diagram the two fingers are horizontal at right angles and the thumb is vertical and at right angles to both. In fact, first finger, second finger and thumb are all at right angles to each other. **The Right Hand Grip Rule **

A current also produces a magnetic field. The magnetic field will loop around the conductor. We can find the sense in which it loops by gripping the conductor carrying the current in our right hand. The fingers will point in the direction of the field. This shown below to the left. We can also apply it to solenoids, in a sense, backwards. If the fingers point in the direction of the current, the thumb will point AGAINST the magnetic field.