First slide

Earth's Magnetism

Question

At a place the value of H and V are 0.4 × 10^–4T and 0.3 × 10^–4T respectively. The resultant earth's magnetic field is

Moderate

A

0.5 × 10^–4T
B

10^–4T
C

2 × 10^–4T
D

None of these

Solution

$\begin{array}{rcl} B & = & \sqrt{{B_{H}}^{2} + {B_{V}}^{2}} \\ = & (\sqrt{{(0.3)}^{2} \times 10^{- 8} + {(0.4)}^{2} x 10^{- 8}}) \\ = & 0.5 x 10^{- 4} T \end{array}$

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