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A bar magnet of length 3 cm has points A and B along its axis at distances of 24 cm and 48 cm on the opposite sides. Ratio of magnetic fields at these points will be

(a) 8                               (b)122

(c) 3                               (d) 4

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If the angles of dip at two places are 30o and 45o respectively, then the ratio of horizontal  components of earth's magnetic field at the two places will be

(a) 3:2                       (b) 1:2

(c) 1:3                          (d) 1:2

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A line passing through places having zero value of magnetic dip is called

(a) Isoclinic line             (b) Agonic line

(c) Isogonic line             (d) Aclinic line

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