A 30 cm long solenoid has 10 turns per cm and area of 5 cm$$^2$$. The current through the solenoid coil varies from 2 A to 4 A in 3.14 s. The e.m.f. induced in the coil is $$\alpha \times 10^{-5}$$ V. The value of $$\alpha$$ is __________.

A

60

B

12

C

120

D

34