Q 1153045844.     At a certain place, the angle of dip is `60^o` and the horizontal component of earth’s magnetic field `(B_H )` is `0.8 *10^-4 T` . The earth’s overall magnetic field is

A

`1.6*10^-4 T`

B

`1.5*10^-4 T`

C

`1.6*10^-3 T`

D

`1.5*10^-3 T`

HINT

`B_H=Bcostheta`
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