| Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as: |
| Assertion [A]: A clinic lines on the magnetic map represents lines of equal dip. |
| Reason (R): When the horizontal and vertical components of the Earth's magnetic field are equal, the angle of dip is \[60{}^\circ \]. |
A) Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A]
B) Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A]
C) Assertion [A] is true but Reason (R) is false
D) Assertion [A] is false and Reason (R) is also false
Correct Answer: D
Solution :
(d) The angle of dip is the angle between the axis of the dip needle in the magnetic meridian and the horizontal direction. \[\text{tan}\theta \text{=}\frac{\text{Vertical}\,\,\text{component}\,\,\text{of}\,\,\text{the}\,\,\text{Earth }\!\!'\!\!\text{ s}\,\,\text{magnetic}\,\,\text{field}}{\text{Horizontal}\,\,\text{component}\,\,\text{of}\,\,\text{the}\,\,\text{Earth }\!\!'\!\!\text{ s}\,\,\text{magnetic}\,\,\text{field}}\] \[=\frac{{{B}_{V}}}{{{B}_{H}}},\] 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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