| ASSERTION: Aclinic lines on the magnetic map represent lines of equal dip. |
| REASON: When the Horizontal and vertical Components of the earth's magnetic field are equal, the angle of dip is \[60{}^\circ \]. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: D
Solution :
The angle of dip is the angle between the axis of the dip needle in the magnetic meridian and the horizontal direction. \[\tan \theta =\frac{vertical\text{ }component\text{ }of\text{ }the\text{ }earth's\text{ }magnetic\text{ }field}{Horizontal\text{ }component\text{ }of\text{ }the\text{ }earth's\text{ }magnetic\text{ }field}\]\[=\frac{{{B}_{V}}}{{{B}_{H}}}\] . When \[{{B}_{V}}={{B}_{H}},\,\tan \,\theta =1\] \[\Rightarrow \,\,\theta =45{}^\circ \] Lines joining points of zero dip are called Aclinic lines. Lines joining points of equal dip are called isoclinic lines.
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