The relation between $Z_E, H_E$,and $B_E$ is . . . . . . .

  • A
    $B_E = \sqrt{Z_E^2 + H_E^2}$
  • B
    $B_E = Z_E \cdot H_E$
  • C
    $B_E = \frac{Z_E}{H_E}$
  • D
    $B_E = \frac{H_E}{Z_E}$

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The Earth's magnetic field was flipped by $180^{\circ}$ a million years ago. This flip was relatively rapid and took $10^5 \, \text{years}$. Then, the average change in orientation per year during the flip was closest to ............ $s$.

The correct relation is:
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