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What happens to the voltmeter reading when S2 is opened, so that both switches are open? How could you obtain the length of time between the opening of S1 and the opening of the switch S2 using the voltmeter readings in parts 1 and 3 above? (Assume that the values of C and R are known.) Explain fully how this circuit can be used to measure the time it takes a ball bearing to fall from an electromagnet to opening a trap door in the experiment to measure the acceleration due to gravity by free-fall. (An incomplete diagram is shown below.)  EMBED SmartDraw.2  Please note that this is an incomplete diagram. Fuller diagrams may be found in various textbooks. The diagram you have to draw must resemble the CR-circuit diagram shown at the top. You will have to complete this task practically in three weeks time, so it is important that you understand the principles of the experiment beforehand. PAGE  PAGE 2 ij~45LM     0JmHnHu0J j0JU j8Uj;? UVmH sH 5\H*jA ;? 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