At magnetic equator, total intensity of Earth’s magnetic field is I_E and at poles it is I_P. They are related as

• A

  $2{\mathrm{I}}_{\mathrm{P}}={\mathrm{I}}_{\mathrm{E}}$

• B

  ${\mathrm{I}}_{\mathrm{P}}=2{\mathrm{I}}_{\mathrm{E}}$

• C

  $\sqrt{3}{\mathrm{I}}_{\mathrm{P}}={\mathrm{I}}_{\mathrm{E}}$

• D

  ${\mathrm{I}}_{\mathrm{P}}=\sqrt{3}{\mathrm{I}}_{\mathrm{E}}$