Q. At a certain place, the angle of dip is 30${^\circ}$ and the horizontal component of earth’s magnetic field is 0.50 oersted. The earth’s total magnetic filed (in oersted) is
A) $\sqrt{3}$
B) 1
C) $\frac{1}{\sqrt{3}}$
D) $\frac{1}{2}$
Explanation
(c) $R = \frac{H}{\cos\delta} = \frac{0.50}{\cos 30{^\circ}} = \frac{0.50 \times 2}{\sqrt{3}} = \frac{1}{\sqrt{3}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.