Understanding Capacitance: Calculating Electric Fields with an Air Gap Capacitor

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To calculate the electric field strength between the plates of a 0.80 µF air gap capacitor that are 2 mm apart with a charge of 72 µC, the relevant equation relates charge (Q), capacitance (C), and voltage (V). The user expresses a lack of guidance from their teacher and textbook, seeking assistance in understanding the concepts and calculations involved. Additionally, there is a related problem regarding the electric field between two charges of -8 µC and 7 µC that are 8 cm apart. The discussion emphasizes the need for clear formulas and examples to facilitate learning. Understanding these principles is crucial for solving capacitor-related problems effectively.
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Homework Statement



How strong a field between plates 0.80 uf air gap capacitator if 2 mm apart has charge of 72 ucol?

Homework Equations



My teacher has not given a formula, any examples, etc. I really would like to learn this and its not in the textbook. Please help, thanks.

The Attempt at a Solution



I won't lie because I have no clue.
 
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I also have a problem that says what is the magnitude and direction of the electrical field at a point midway between -8 ucoul and 7 ucol charge 8 cm apart? assume no other charges nearby.
 
cwrx14 said:

Homework Statement



How strong a field between plates 0.80 uf air gap capacitator if 2 mm apart has charge of 72 ucol?

Homework Equations



My teacher has not given a formula, any examples, etc. I really would like to learn this and its not in the textbook. Please help, thanks.

The Attempt at a Solution



I won't lie because I have no clue.

Try the equation that relates Q, C, and V.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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