PPRuNe Forums > Wannabes Forums > Professional Pilot Training (includes ground studies) > General Magnetism Question - ATPL PDA View Full Version : General Magnetism Question - ATPL ibcd31st Aug 2007, 08:00Please help me with this one. Q. Z is 45 and the T value is 76 units. The values of dip and force H will be: a) 36.3 61 b) 53.7 61 c) 59.5 66 d) 61.3 36 The correct answer mentioned is a). But I have trouble figuring out the values. For reference: tan dip = Z/H and T = H/cos dip Taken from Ground Studies for Pilots - Navigation page 48 example 7. Thanks... BEagle31st Aug 2007, 09:18tan dip = Z/H H = T cos dip therefore (tan dip x cos dip) = Z/T since tan x cos = sin, sin dip = Z/T; dip = arcsin 0.5921 = 36.3 H = 76 x cos 36.3 = 61.2 So I would say that a) is indeed the correct answer - although I have no idea what the subject is about. Just basic trigonometry and algebra - it is the wont of the JAA to ask rather pointless questions....and answer d) is a deliberate ploy to ensure you RTFQ! ibcd31st Aug 2007, 15:51Thanks a lot. Had a brain fart for a few moments :)