Which one of the following is not true for an α-helix

Right-handed (clockwise) α-helix is more stable and therefore is the usual α-helix pattern found in the natural secondary structure. Left-handed α-helix is not common. α-helix is the most common secondary structure in proteins. α-helix has an overall dipole moment: amino terminus of an alpha helix is positive and carboxy terminus is negative. All hydrogen bonds in a-helix are parallel (i.e. in the same direction).