The wire RS has a circular cross-section along its length. At the R end of the wire, the cross-sectional area is $A$. At the S end of the wire, the cross-sectional area is $\frac{A}{2}$. A charge of $Q$ requires time $t$ to move through the R end of the wire. The current in the wire is constant. What amount of charge will pass through the S end in a time interval of $\frac{t}{4}$?
- A$\frac{Q}{8}$
- B$\frac{Q}{4}$
- C$\frac{Q}{2}$
- D$Q$