Large capacitors can hold a potentially dangerous charge long after a circuit has been turned off, so it is important to make sure they are discharged before you touch them. Suppose a 120 μF capacitor from a camera flash unit retains a voltage of 190 V when an unwary student removes it from the camera. ▼ Part A If the student accidentally touches the two terminals with his hands, and if the resistance of his body between his hands is 1.8 ks, for how long will the current across his chest exceed the danger level of 50 mA? Express your answer with the appropriate units. t = μà Value Units ?

Consider the circuit below. We have C1 = 10. pF, C2 = 20. pF, C3 = 30. pF, and V = 6.0 V. Answer the questions to follow regarding this circuit. i. What is the charge on C3? ii. What is the potential across C1? iii. What is the charge on C2? iv. What is the total energy stored in this system of capacitors?

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(Figure 1) shows a 5 V battery with metal wires attached to each end. Figure 3 + 2 1 of 1 ▼ Part A What are the potential differences AV12 = V2 - V₁, AV23 = V3 - V2, AV34 = V4 - V3, and AV41= V₁ - V4? Enter your answers numerically separated by commas. AV12, AV23, AV34, AV41 = Submit Provide Feedback Request Answer 15| ΑΣΦ ? V

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Problem 5: In the circuit below AVbat. C1 = 15 µF, C2 = 20 µF, C3 = 30 µF are initially uncharged. (a) What is Q1,a, Q2,a, Q3,a? The charges on the capacitors when S is closed at position a. Answers: Q1.a The switch is then put in position b. What is Q1,b, Q2,b, Q3,6? The charges on the capacitors when S is put in position b. Answers: Q1,b = 833.3 µC, Q2,6 = 666.7 µC, Q3,6 = 666.7 µC. 100 V, the switch S is initially open, and the capacitors = 1500 µC, Q2,a = 0 µC, Q3,a = 0 µC. (b) b а C2 AVpat C1 C3