Its magnitude is L=rp sin 6 (10-2) where 0 is the smaller angle between r and p, we also can write it as Note that for convenience and p are in Xy plane.Its magnitude is (10-2) where is the smaller angle between and , we also can write it as Note that , for convenience and are in xy plane. L = rp sin   = ⊥ = ⊥ L pr rp → P → r → P → r