Question

At a certain place the angle of dip is 30° and the horizontal component of earth’s magnetic field is 0.5 G. The earth’s total magnetic field (in G), at that certain place, is

• A. $\frac{1}{\sqrt3}$
• B. $\frac{1}{2}$
• C. $\sqrt3$
• D. 1

Answer 1

Answer: (A)

$\frac{1}{\sqrt3}$

Answer 2

The correct option is(A): $\frac{1}{\sqrt3}$

B H = B cos30°

$⇒B=\frac{1}{\sqrt3}G$