The angle of the dip at a place is 40.6° and the vertical component of the earths magnetic field BV = 6 ×10^-5 T. The total intensity….

Q. The angle of the dip at a place is 40.6° and the vertical component of the earths magnetic field BV = 6 × 10-5  T. The total intensity of the earth’s magnetic field at this place is (sin 40.6° = 0.65)

(a) 7 × 10-5 T

(b) 6 × 10-5 T

(c) 5 × 10-5 T

(d) 9.2 × 10-5 T

Ans: (d)

Sol: $ \displaystyle B_v = B sin\theta $

$ \displaystyle B = \frac{B_v}{sin\theta} $

$ \displaystyle B = \frac{6\times 10^{-5}}{sin 40.6} $

$\displaystyle B = \frac{6\times 10^{-5}}{0.65} $

= 9.2 × 10-5 T

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