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Magnetic Field

12.A dip need...

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12.A dip needle arranged to move freely in the magnetic meridian dips by an angle theta.If the vertical plane in which the needle moves is rotated through an angle alpha to the magnetic meridian, then the needle will dip by an angle a)theta b)alpha c)more than theta d)less than theta

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A dip circle is so set that the dip needle moves freely in the magnetic meridian. In this position the angle of dip is $39^{\circ}$ . Now the dip circle is rotated so that the plane in which the needle moves, makes an angle of $30^{\circ}$ with the magnetic meridian. In this position, the needle will dip by an angle :

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