An electron has mass \[9\times {{10}^{-31}}\,kg\] and charge \[1.6\times {{10}^{-19}}C\] is moving with a velocity of \[{{10}^{6}}\,m/s\], enters a region where magnetic field exists. If it describes a circle of radius 0.10 m, the intensity of magnetic field must be [NCERT 1982; CPMT 1989; DCE 2005]

• A.            \[1.8\times {{10}^{-4}}\,T\]   
• B.            \[5.6\times {{10}^{-5}}\,T\]
• C.            \[14.4\times {{10}^{-5}}\,T\] 
• D.            \[1.3\times {{10}^{-6}}\,T\]