An electron has a mass of \[9.1\times {{10}^{-31}}kg\]. It revolves round the nucleus in a circular orbit of radius \[0.529\times {{10}^{-10}}metre\]at a speed of \[2.2\times {{10}^{6}}m/s\]. The magnitude of its linear momentum in this motion is [AFMC 1988]

• A.            \[1.1\times {{10}^{-34}}kg-m/s\]   
• B.            \[2.0\times {{10}^{-24}}kg-m/s\]
• C.            \[4.0\times {{10}^{-24}}kg-m/s\]   
• D.            \[4.0\times {{10}^{-31}}kg-m/s\]