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Q 26 from chapter magnetism and matter, pls provide an understandable explanation

Q 26 from chapter magnetism and matter, pls provide an understandable explanation

Question Image
Grade:12

1 Answers

Vikas TU
14149 Points
2 years ago
Dear student 
Let the vertical component of earth's magnetic field be V and its horizontal component at magnetic meridian be H.
Then the angle of dip θ at magnetic meridian will be given by
tanQ = V/H 
When the dip needle is suspended at an angle of 
30∘
 to the earth magnetic meridian then it makes an angle 
45∘
 with the horizontal.
In this situation vertical component of earth's field responsible for its orientation with the horizontal direction, remains same as V
 but the component in horizontal direction becomes 
H=cos30∘
tan45 = V/ Hcos 30
V/H = cos 30 
Comparing the equation 
Q = tan inv ( sqrt 3 /2 ) 
Q = 40.9 degree
 

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