NAME: BATTERY IS TURNED ON TO +1.5 V. BATTERY IS TURNED ON TO -1.5 V.
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1 AP PHYSICS 2 LAB: CAPACITANCE NAME: Google: Phet capacitor lab PART I CAPACITOR Go to the tab Dielectric Increase the plate area to 4. mm 2. Make sure the offset of the dielectric is. mm. Make sure the distance separation between plates is 1. mm. Check mark the views: Plate charges, and Electric field lines Q 1. Draw the distribution of charges an electric field lines when: BATTERY IS TURNED ON TO +1.5 V. BATTERY IS TURNED ON TO -1.5 V. C = q = Uq = E = C = q = Uq = E = Q 2. How do the measurements from the meters change, when the electric potential difference of the battery is +1.5v and -1.5v? Q 3. With your own words describe a capacitor.
2 C CAPACITANCE ELECTRIC CHARGE ELECTRIC POTENTIAL ENERGY d A q V U q 2 VACUUM PERMITTIVITY 8.85x1-12 N m 2 C 2 ELECTRIC FIELD E V d CONVERSIONs: From mm to m, divide the amount of mm by 1 mm From mm 2 to m 2, divide the amount of mm 2 by (1 mm) 2 PART II CAPACITANCE Make sure the offset of the dielectric is. mm. Q 4. Complete the chart below: kappa = 3 C = Distance separation d = 1. mm q = Plate Area A = 1. mm 2 Uq = Electric Potential difference V = 1.5 v E = Q 5. Show your work to calculate physical quantities: Electric potential energy
3 PART III EFFECT OF THE DIELECTRIC CONSTANT ON THE CAPACITANCE OF THE CAPACITOR Make sure the offset of the dielectric is. mm. Q 6. Complete the chart below: kappa = 5 C = Distance separation d = 1. mm q = Plate Area A = 1. mm 2 Uq = Electric Potential difference V = 1.5 v E = Q 7. How does the dielectric constant affect the capacitance of the capacitor? (increase or decrease) WHEN INCREASES WHEN DECREASES PART IV EFFECT OF THE DISTANCE SEPARATION ON THE CAPACITANCE OF THE CAPACITOR Make sure the offset of the dielectric is. mm. Q 8. Complete the chart below: kappa = 3 C = Distance separation d = 5. mm q = Plate Area A = 1. mm 2 Uq = Electric Potential difference V = 1.5 v E = Q 9. How does the distance separation affect the capacitance of the capacitor? (increase or decrease) WHEN d INCREASES WHEN d DECREASES
4 PART V EFFECT OF THE PLATE AREA ON THE CAPACITANCE OF THE CAPACITOR Q 1. Make sure the offset of the dielectric is. mm. Complete the chart below: kappa = 3 C = Distance separation d = 1. mm q = Plate Area A = 4. mm 2 Uq = Electric Potential difference V = 1.5 v E = Q 11. How does the plate area affect the capacitance of the capacitor? (increase or decrease) WHEN A INCREASES WHEN A DECREASES PART VI EFFECT OF THE ELECTRIC POTENTIAL DIFFERENCE ON THE CAPACITANCE OF THE CAPACITOR Q 12. Make sure the offset of the dielectric is. mm. Complete the chart below: kappa = 3 C = Distance separation d = 1. mm q = Plate Area A = 1. mm 2 Uq = Electric Potential difference V = 1. v E = Q 13. How does the electric potential difference affect the capacitance of the capacitor? (increase or decrease) WHEN V INCREASES WHEN V DECREASES
5 PART VII THE REAL CAPACITOR You will need: Wires 1 resistor 1 capacitor cellphones or digital cameras Stopwatch Batteries Q 14. Look at all the electric components of the circuit: DRAW THE ELECTRIC CIRUIT DRAW THE CIRUIT DIAGRAM (USE SYMBOLS) Q 15. Place a running stop watch (could be your phone) next to the two voltmeters. Connect the wires to the battery. Make a video that focus on the two voltmeters and the stop watch. With your own words describe what happens (voltmeters). Q 16. Complete the chart below (every 5 seconds): TIME (STOP WATCH) CLOCK READING (SET YOUR ZERO) ELECTRIC POTENTIAL DIFFERENCE ACROSS THE RESISTOR ELECTRIC POTENTIAL DIFFERENCE ACROSS THE CAPACITOR
6 ELECTRIC POTENTIAL DIFFERENCE Q 17. Graphs RESISTOR [red] CAPACITOR [blue] TIME [seconds] Q 18. What type of relationships are observed for the resistor and the capacitor [ask your teacher for some help] Q 19. What quantities affect the capacitance of a capacitor? Q 2. What happen to the charges in the capacitor (initially charged) when you click on disconnect battery? Explain why.
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