A uniform magnetic field B is acting from south to north and is of magnitude 1.5 \[Wb/{{m}^{2}}\]. If a proton having mass \[=1.7\times {{10}^{-27}}\,kg\] and charge \[=1.6\times {{10}^{-19}}\,C\] moves in this field vertically downwards with energy 5 MeV, then the force acting on it will be [Pb. PMT 2002]

• A.            \[7.4\times {{10}^{12}}\,N\] 
• B.            \[7.4\times {{10}^{-12}}\,N\]
• C.            \[7.4\times {{10}^{19}}\,N\] 
• D.            \[7.4\times {{10}^{-19}}\,N\]