Chapter 21.7, Problem 21.6QQ

With the switch in the circuit of Figure 21.18a open, there is no current in R₂. There is current in R₁, however, and it is measured with the ammeter at the right side of the circuit. If the switch is closed (Fig. 21.18b), there is current in R₂. What happens to the reading on the ammeter when the switch is closed? (a) The reading increases. (b) The reading decreases. (c) The reading does not change.