Potential difference(capacitor)

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SUMMARY

The discussion centers on the potential difference in capacitors, specifically addressing a capacitor with one plate at +75 V and the other at -75 V. This configuration indicates a total potential difference of 150 V across the capacitor, as the voltage is defined by the difference between the two plates. The charge stored on each plate is equal in magnitude but opposite in sign, with the positive plate holding +Q and the negative plate holding -Q. Understanding these principles is crucial for analyzing capacitor behavior in electrical circuits.

PREREQUISITES
  • Basic understanding of capacitor theory
  • Familiarity with voltage and potential difference concepts
  • Knowledge of charge storage in capacitors
  • Understanding of the relationship between charge (Q), capacitance (C), and voltage (V) as described by the equation Q = C V
NEXT STEPS
  • Study the relationship between capacitance and voltage in different capacitor configurations
  • Explore the effects of varying voltage on charge storage in capacitors
  • Learn about series and parallel capacitor circuits and their impact on total capacitance
  • Investigate the role of capacitors in AC circuits and their behavior under alternating current
USEFUL FOR

Students studying electrical engineering, educators teaching capacitor theory, and professionals working with electronic circuit design will benefit from this discussion.

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Homework Statement



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Homework Equations





The Attempt at a Solution



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1) "One plate is maintained at +75 V while the other at -75 V by a d.c. supply" means? Does it means that this capacitor is connected to a 150 V d.c. supply or just a 75 V?
2) Why is 75-(-75)? Why don't we just use 75V?
3) Charge stored on each plate is it the same as charge stored in the whole capacitor?
:confused:
 

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stpmmaths said:
1) "One plate is maintained at +75 V while the other at -75 V by a d.c. supply" means? Does it means that this capacitor is connected to a 150 V d.c. supply or just a 75 V?
All that matters with capacitors is the potential difference across the plates because that is the voltage V as in Q = C V. So you can view this as one plate being at potential 0 V and the other at 150 V or -75 V and 75 V, or 250 V and 100 V.
2) Why is 75-(-75)? Why don't we just use 75V?
See above. What is the difference in electrostatic potential between the plates?
3) Charge stored on each plate is it the same as charge stored in the whole capacitor?
:confused:

One plate has positive charge (+Q) and the other plate has negative charge of the same magnitude (-Q). By convention, when we say "the charge on the capacitor", we mean the charge on the positive plate, +Q.
 
Thanks.
 

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