A coil of resistance 400Q is placed in a magnetic field. If the magnetic flux \[\phi \] (wb) linked with the coil varies with time t (sec) as\[\phi =50{{t}^{2}}+4\]. The current in the coil at t=2 sec is:

• A. 0.5 A
• B. 0.1 A
• C. 2 A   
• D. 0.0416666666666667