The horizontal components of earth’s magnetic field at a place is $0.3\times {10}^{-4}$ T. If the angle of dip is ${60}^0$, what is the total earth’s magnetic field?

• A

  $6\times {10}^{-3} T$

• B

  $1.5\times {10}^{-3} T$

• C

  $\sqrt{3}\times {10}^{-4} T$

• D

  $0.6\times {10}^{-4} T$