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The magnetic field due to a short magnet at a point on its axis at distance X cm from the middle point of the magnet is 200 Gauss. The magnetic field at a point on the neutral axis at a distance X cm from the middle of the magnet is
(a) 100 Gauss               (b) 400 Gauss
(c) 50 Gauss                 (d) 200 Gauss