The angle of dip at a place is 40.6o and the intensity of the vertical component of the earth's magnetic field \[V=6\times {{10}^{-5}}\]Tesla. The total intensity of the earth's magnetic field (I) at this place is [MP PMT 1993]

• A.            \[7\times {{10}^{-5}}tesla\]   
• B.            \[6\times {{10}^{-5}}tesla\]
• C.            \[5\times {{10}^{-5}}tesla\]   
• D.            \[9.2\times {{10}^{-5}}tesla\]