viewimage.php?no=24b0d769e1d32ca73dec84fa11d0283195504478ca9b7677dc322d30cb339b4542242e4db2bcc146c2d7ba069fb7da11d957ba5d75bf2f21dbeabc5560a86339bd8cfc5cdb6497327423

mg√3/2=1/4v 아님?
F=BIl
답이 4번이래네...?