AutoSave . OFF @ 1402 Capacitor and Dielectrics Lab - Saved Home Insert Draw Design Layout References Mailings Review View ? Tell me Share Comments Times New... 12 Aav 24 AaBbCcDdEe AaBbCcDdEe AaBbCcDdl AaBbCcDdEe AaBbCcDdEe AaBb( Paste ~ A v Heading 2 Title Sensitivity BIU A Normal No Spacing Heading 1 Heading 3 styles Dictate Pane Question 3: When the capacitor is connected to a battery and you halved its area, which variables will also be halved? Explain and prove with equations. 2B. Changing capacitor area while battery is dis-connected Procedure: 1. Click on "reset all" (confirm yes when asked). 2. Slide the battery slider all the way up. 3. Disconnect the battery . Check all the meters and "Plate Charges" on. Do not forget to connect the voltage probes to the plates 5. Slowly increase the area of the plates by dragging the little double arrow away from the plates and observe the changes. 6. Fill in the table below for two different areas. C VI E U (mm?) (mm) (F) (V) (C) (V/m) 100 10 400 10 Page 6 of 12 1534 words English (United States) Focus 100%AutoSave . OFF @ 1402 Capacitor and Dielectrics Lab - Saved Home Insert Draw Design Layout References Mailings Review View ? Tell me Share Comments Times New... 12 Aav E AaBbCcDdEe AaBbCcDdEe AaBbCcDdl AaBbCcDdEe AaBbCcDdEe AaBb( Paste BIU A ~ A v Normal No Spacing Heading 1 Heading 2 Heading 3 Title styles Dictate Sensitivity Pane When insulating materials (dielectrics) are inserted between the plates, they get polarized under electric field. Dielectrics can be used to increase the capacitance of a capacitor. When a dielectric is inserted, the capacitance of the capacitor is given by C = - KEQA where O is the dielectric constant of the insulating material. Every material has its own constant. For air, 0 =1 and for common dielectric materials like Teflon, paper, glass ate >1 so that capacitance is larger with them. Procedure: On your browser, go to https://phet.colorado.edu/ Click on "Simulations" -> "Physics" -> "Electricity, Magnets & Circuits" -> "Capacitor Lab" -> Download or run When you start the simulation, you will see a page like this: Capacitor Lab (2 02) Introduction View- Meters Plate Chunpe Page 2 of 12 1534 words English (United States) Focus 100%AutoSave . OFF @ 1402 Capacitor and Dielectrics Lab - Saved Home Insert Draw Design Layout References Mailings Review View ? Tell me Share Comments Times New... 12 Aav AaBbCcDdEe AaBbCcDdEe AaBbCcDdl AaBbCcDdEe AaBbCcDdEe AaBb( Paste BIU A v . ~ A v Normal No Spacing Heading 1 Heading 2 Heading 3 Title styles Dictate Sensitivity Pane Question 1: Explain which of the following decreases, increases or stays the same when we increase the area while battery is dis-connected. Change (increase/decrease/stay the same) Capacitance Charge on plates Voltage across plates Net electric field between plates Energy stored in the capacitor Question 2: Show your stored energy calculations for both A = 100 mm and A = 400 mm? areas. Why do you think they are different? Explain and show your proof. Question 3: When a charged capacitor is disconnected from a battery and area of the plates is decreasing; describe what is happening to electric field in the capacitor? Explain why, with using formulas. Page 7 of 12 1534 words English (United States) Focus 100%AutoSave . OFF @ 1402 Capacitor and Dielectrics Lab - Saved Home Insert Draw Design Layout References Mailings Review View Tell me Share Comments Times New... 12 Aav 21 AaBbCcDdEe AaBbCcDdEe AaBbCcDdl AaBbCcDdEe AaBbCcDdEe AaBb( Paste BIU A ~ A v Normal No Spacing Heading 1 Heading 2 Heading 3 Title styles Dictate Sensitivity Pane 0 C VI U ( mm ? ) (mm) (F ) (V) (c) (V/m) () 100 10 400 10 Question 1: After you fill the table, calculate capacitance (C), charge (Q), electric field (E) and stored energy (U) for the case where A = 400 mm? and d = 10 mm to verify simulation results. Do not forget to show your formulas and units. Question 2: Explain which of the following decreases, increases or stays the same when we increase the area while battery is connected. Change (increase/decrease/stay the same) Capacitance Charge on plates Voltage across plates Net electric field between plates Energy stored in the capacitor 5 Page 5 of 12 1534 words English (United States) Focus 100%AutoSave . OFF @ 1402 Capacitor and Dielectrics Lab - Saved Home Insert Draw Design Layout References Mailings Review View ? Tell me Share Comments Times New... 12 Aav 21 AaBbCcDdEe AaBbCcDdEe AaBbCcDdl AaBbCcDdEe AaBbCcDdEe AaBb( Paste BIU A ~ A v Normal No Spacing Heading 1 Heading 2 Heading 3 Title styles Dictate Sensitivity Pane Experiment 1: Charging a Capacitor Procedure: 1. Disconnect the battery by clicking on the control. 2. Uncheck "Plate Charges 3. Check voltmeter. 4. Attach the red probe to the top plate and the black one to the bottom plate. 5. Slide the slide on the batter all the way up to 1.5V. 6. Connect the battery. You should be seeing a picture like the one below: Disconnect Battery 10 0 mm I 15V Plate Are 10010 mm Question 1: Check the electric field lines box. In the space below, draw the capacitor and draw the electric field lines inside it. Which plate is positive and which plate is negative? 3 Page 3 of 12 1534 words English (United States) Focus E 100%AutoSave . OFF @ 1402 Capacitor and Dielectrics Lab - Saved Home Insert Draw Design Layout References Mailings Review View Tell me Share Comments Times New... 12 Aav AL AaBbCcDdEe AaBbCcDdEe AaBbCcDdl AaBbCcDdEe AaBbCcDdEe AaBb( Paste A ~ A v Normal No Spacing Heading 1 Heading 2 Heading 3 Title styles Dictate Sensitivity BIU Pane Experiment 2: Changing capacitor area 2A. Changing capacitor area while battery is connected Procedure: 1. Check all the meters and "Plate Charges" on, like the picture below. Your battery has the slider all the way up. Do not forget to connect the voltage probes to the plates. Disconnect Barbary Plate Area 2. Slowly increase the area of the plates by dragging the little double arrow away from the plates and observe the changes. 3. Fill in the table below for two different areas. Page 4 of 12 1534 words English (United States) Focus E 100%AutoSave . OFF @ 1402 Capacitor and Dielectrics Lab - Saved Home Insert Draw Design Layout References Mailings Review View ? Tell me Share Comments Times New... 12 Aav AaBbCcDdEe AaBbCcDdEe AaBbCcDdl AaBbCcDdEe AaBbCcDdEe AaBb( Paste BIU A v . ~ A v Normal No Spacing Heading 1 Heading 2 Heading 3 Title styles Dictate Sensitivity Pane Experiment 3: Changing Separation 3A. Changing capacitor separation while battery is connected Procedure: 1. Click on "reset all" (confirm yes when asked). 2. Slide the battery slider all the way up. 3. Keep the battery connected. 4. Maximize the area of the plates (400 mm?). 5. Check all the meters and "Plate Charges" on. Do not forget to connect the voltage probes to the plates. 6. Slowly change the separation between the plates by dragging the little double arrow down or up and observe the changes. 7. Fill in the table below for two different separations. C (mm ? ) (mm) (F) (V) (C) (V/m) () 400 10 400 5 Question 1: Explain which of the following decreases, increases or stays the same when we decrease the separation while battery is connected. Page 8 of 12 1534 words English (United States) Focus 100%AutoSave . OFF @ 1402 Capacitor and Dielectrics Lab - Saved Home Insert Draw Design Layout References Mailings Review View ? Tell me Share Comments Times New... 12 Aav 24 AaBbCcDdEe AaBbCcDdEe AaBbCcDdl AaBbCcDdEe AaBbCcDdEe AaBb( Paste BIU A ~ A v Normal No Spacing Heading 1 Heading 2 Heading 3 Title styles Dictate Sensitivity Pane 5. Slowly insert the dielectric between the plates by dragging the little double arrow to the left (make sure offset is zero and dielectric is completely placed). Note that the default dielectric number (0) is 5. Do not change that. 6. Fill in the table below. IVI E C 0 (mm?) (mm) (F ) (V) (C) (V/m) 100 10 1 (air) 5 (filled 100 10 completely) Question 1: Explain which of the following decreases, increases or stays the same when we insert a dielectric while battery is dis-connected. Change (increase/decrease/stay the same) Capacitance Charge on plates Voltage across plates Net electric field between plates Energy stored in the capacitor 48: Inserting dielectric while battery is connected Procedure: 1. Click on "Reset all" (confirm yes when asked) 2. Slide the battery slider all the way up. 3. Keep the battery connected. 4. Check all the meters and "Plate Charges" on. Do not forget to connect the voltage probes to the plates. 5. Slowly insert the dielectric between the plates by dragging the little double arrow to the left (make sure offset is zero and dielectric is completely placed). Note that the default dielectric number (0) is 5. Do not change that. 11 Page 11 of 12 1534 words English (United States) Focus 100%AutoSave . OFF @ 1402 Capacitor and Dielectrics Lab - Saved Home Insert Draw Design Layout References Mailings Review View ? Tell me Share Comments Times New... 12 Aav AaBbCcDdEe AaBbCcDdEe AaBb CcDdl AaBbCcDdEe AaBbCcDdEe AaBb( Paste BIU A ~ A v Normal No Spacing Heading 1 Heading 2 Heading 3 Title styles Dictate Sensitivity Pane 6. Fill in the table below. C U (mm?) (mm) (F) (V) (C) (V/m) (1) 100 10 1 (air) 100 10 (filled completely) Question 1: Explain which of the following decreases, increases or stays the same when we insert a dielectric while battery is connected. Change (increase/decrease/stay the same) Capacitance Charge on plates Voltage across plates Net electric field between plates Energy stored in the capacitor Question 2: The capacitor is connected to a battery. When you insert a dielectric into a capacitor while the capacitor is still connected to a battery, does the energy stored in the capacitor increase or decrease? Explain and use the formulas. Question 3: The capacitor is charged and then disconnected from the battery. When you insert a dielectric into a capacitor while the capacitor is charged but disconnected from the battery, does the energy stored in the capacitor increase or decrease? Explain and use the formulas. 12 Page 12 of 12 1534 words * English (United States) Focus 100%AutoSave . OFF @ 1402 Capacitor and Dielectrics Lab - Saved Home Insert Draw Design Layout References Mailings Review View Tell me Share Comments Times New... 12 Aav E 24 AaBbCcDdEe AaBbCcDdEe AaBbCcDdl AaBbCcDdEe AaBbCcDdEe AaBb( Paste BIU A v . ~ A v Normal No Spacing Heading 1 Heading 2 Heading 3 Title styles Dictate Sensitivity Pane Name : Capacitors and Dielectrics: Phet Lab Introduction: Capacitor is an electrical element that stores charge and energy. Charge Q that is stored in a capacitor is proportional to the applied voltage V. Capacitance (C) is the constant of proportionality. C=_ DVC Capacitance of a capacitor is a measure of charge capacity and it only depends on size, shape and spacing of electrodes. A capacitor is shown below in the figure. Plates have area A + + te Two parallel and identical plates of any shape with an area A are separated by a distance of d. By charging one of the plates with positive and the other plate with an equal amount of negative charge, a capacitor stores energy. Capacitance of the capacitor is given by GOA d where Do = 8.85 x 10-12 F/m is a constant . Page 1 of 12 1534 words Of English (United States) Focus 100%AutoSave . OFF @ 1402 Capacitor and Dielectrics Lab - Saved Home Insert Draw Design Layout References Mailings Review View ? Tell me Share Comments Times New... 12 Aav AaBbCcDdEe AaBbCcDdEe AaBbCcDdl AaBbCcDdEe AaBbCcDdEe AaBb( Paste BIU A v . ~ A v Normal No Spacing Heading 1 Heading 2 Heading 3 Title styles Dictate Sensitivity Pane Change (increase/decrease/stay the same) Capacitance Charge on plates Voltage across plates Net electric field between plates Energy stored in the capacitor Question 2: When a capacitor is connected to a battery and when you increase the separation between the plates, describe what is happening to the electric field in the capacitor and explain why. 3B. Changing capacitor separation while battery is dis-connected Procedure: 1. Click on "reset all" (confirm yes when asked). 2. Slide the battery slider all the way up. 3. Disconnect the battery 4. Maximize the area of the plates (400 mm?). 5. Check all the meters and "Plate Charges" on. Do not forget to connect the voltage probes to the plates. 6. Slowly change the separation between the plates by dragging the little double arrow down or up and observe the changes. 7. Fill in the table below for two different separations. C E C (mm?) (mm) (F) (V) (c) (V/m) () 400 10 Page 9 of 12 1534 words English (United States) Focus E 100%AutoSave . OFF @ 1402 Capacitor and Dielectrics Lab - Saved Home Insert Draw Design Layout References Mailings Review View ? Tell me Share Comments Times New... 12 Aav AaBbCcDdEe AaBbCcDdEe AaBbCcDdl AaBbCcDdEe AaBbCcDdEe AaBb( Paste ~ A v Heading 2 Heading 3 Title styles BIU A Normal No Spacing Heading 1 Dictate Sensitivity Pane 400 5 Question 1: Explain which of the following decreases, increases or stays the same when we decrease the separation while battery is dis-connected. Change (increase/decrease/stay the same) Capacitance Charge on plates Voltage across plates Net electric field between plates Energy stored in the capacitor Experiment 4: Changing Dielectric 4A: Inserting dielectric while battery is disconnected Procedure: 1. Click on the dielectric tab to switch to another window. . Slide the battery slider all the way up. 3. Disconnect the battery by clicking on the control. 4. Check all the meters and "Plate Charges" on. Do not forget to connect the voltage probes to the plates. 10 Page 10 of 12 1534 words * English (United States) Focus 100%