The total intensity of earth's magnetic field at the magnetic equator is $5$ $units$. Its value at a magnetic latitude of $37^o $ is equal to
The total intensity of earth's magnetic field at the magnetic equator is $5$ $units$. Its value at a magnetic latitude of $37^o $ is equal to
- A
$\sqrt{73}$ $units$
- B
$\sqrt{52}$ $units$
- C
$4$ $units$
- D
$3$ $units$
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- [KVPY 2020]
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