A magnetic field is directly proportional to the plane of a circular coil of area 0.2m² and 250 turns. If the magnetic field increases from 0.01 T to 0.06 T during a time interval of 0.25 s, the average induced EMF of the coil is:

a) 2,5 V

b) 0,04 V

c) 10 V

d) 0,1 V