The upward force on the left half of the coil and the downward force on the right half of the coil cause the coil to rotate 180 degrees. Once the left side has flipped around to the right (...The upward force on the left half of the coil and the downward force on the right half of the coil cause the coil to rotate 180 degrees. Once the left side has flipped around to the right (and the right side to the left) notice that the current will still be going up on the right and down on the left.