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The correct relation is

$B_H$ $=$ Horizontal component of earth's magnetic field;  $B_V$ $=$ Vertical component of earth's magnetic field and $B  =$  Total intensity of earth's magnetic field

  • A

    $B = \frac{{{B_V}}}{{{B_H}}}$

  • B

    $B = {B_V} \times {B_H}$

  • C

    $|B| = \sqrt {B_H^2 + B_V^2} $

  • D

    $B = {B_H} + {B_V}$

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