Physics-
General
Easy

Question

A dip circle is adjusted so that its needle moves freely in the magnetic meridian. In this position, the angle of dip is 40°. Now the dip circle is rotated so that the plane in which the needle moves makes an angle of 30° with the magnetic meridian. In this position the needle will dip by an angle

  1. 40°    
  2. 30°    
  3. More than 40°    
  4. Less than 40°    

The correct answer is: More than 40°


    tan invisible function application theta equals fraction numerator B subscript V end subscript over denominator B subscript H end subscript end fraction ... (i)
    If apparent dip is theta ´ then
    tan invisible function application theta ´ equals fraction numerator B ´ subscript V end subscript over denominator B subscript H end subscript superscript ´ end superscript end fraction equals fraction numerator B subscript V end subscript over denominator B subscript H end subscript cos invisible function application 3 0 degree end fraction equals fraction numerator B subscript V end subscript over denominator B subscript H end subscript cross times fraction numerator square root of 3 over denominator 2 end fraction end fraction
    Þ tan invisible function application theta ´ equals open parentheses fraction numerator 2 over denominator square root of 3 end fraction close parentheses tan invisible function application theta rightwards double arrow tan invisible function application theta ´ greater than tan invisible function application theta Þ theta ´ greater than theta

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