Kh 3H For the tangent galvanometer when tana a is the angle of the compass...

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Kh 3H For the tangent galvanometer when tana a is the angle of the compass with respect to the earth magnetic field Be S N versus the current in the coil I in mA is plotted as shown in the figure What is the magnitude of the horizontal magnetic field of the earth Be in micro Tesla The number of turns of the coil is N 500 the diameter is 15 cm Select one a 33 b 66 C 53 d 15 O O lang 5 5 0 781 21 2 747 1 mA

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