Answer
Electrons move from 'a' towards 'b' in the conductor.
The amount of charge passes through the cross section of wire in 3 seconds is 9 coloumbs.
Work Step by Step
Formula:
$$Current=\frac{Charge}{Time}$$
so,
Charge through cross section of wire in 3s.
$Charge = current\times time $
=3*3
=9C (ans)
