when a magnetic substance in placed i two uniform magnetic field (b) and (h) which are mutually perpendicular and coplanar to each other. then the magnetic field intensity of magnetic field of b which making angle θ with h is tanθtimes of h.
mathamatically B=tanθxH.
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It is a straight line that touches the curve such that the line is perpendicular to the radius of the curve at the point of contact.
A common tangent is a line which is tangent to two (or more) curves.
tangent(450) = 0.935809013
Tangent 39 = 0.809784033195
196-164/2= 16