A long solenoid of diameter 0.1 m has 2 10* turns per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to OA from 4 A in 0.05 s. If the resistance of the coil is 107 2. the total charge flowing through the coil during this time is :- (a) 16 C (c) 16 C (b) 32 C (d) 32 C