The magnetic flux through a coil perpendicular to its plane is varying according to the relation ϕ=(5t3+4t2+2t−5) Weber. If the resistance of the coil is 5 ohm, then the induced current through the coil at t=2 sec will be:
(A) 15.6 A
(B) 16.6 A
(C) 17.6 A
(D) 18.6 A