**Goal:** Reason regarding capacitors

**Source:** 283-590 RC equivalent at t infinity

Consider the following circuit.

The capacitor is uncharged when the switch is closed at t=0. Which

circuit is equivalent to this circuit as t approaches infinity?

**Goal:** Reason regarding capacitors

**Source:** 283-590 RC equivalent at t infinity

Consider the following circuit.

The capacitor is uncharged when the switch is closed at t=0. Which

circuit is equivalent to this circuit as t approaches infinity?

## Commentary:

## Answer

(2) Students often misunderstand the statement that capacitors behave

like an open circuit after a long time.

This item is best used in conjunction with the previous one. Both should

be asked before discussion of either to reveal whether students just

have the behaviors reversed or evidence a more serious problem.