Length per turn = \( \sqrt{(\text{circumference})^2 + (\text{pitch})^2} = \sqrt{(2\pi \times 0.3)^2 + 0.2^2} = \sqrt{(1.884)^2 + 0.04} \approx \sqrt{3.549 + 0.04} = \sqrt{3.589} \approx 1.895 \) m.