How Do You Solve Basic Electric Field Problems?

AI Thread Summary
To solve basic electric field problems, begin by identifying all the forces acting on the charged particles involved. Understanding the relevant formulas is crucial, but applying them correctly is key to finding the solution. It's important to show your work step-by-step to clarify your thought process. Referencing practice problems, like the one linked, can provide additional context and examples. Mastering these foundational concepts will enhance problem-solving skills in electric fields.
sakrei
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This is a pretty basic problem, but I am a little bit lost. I'm not really sure where to start. Can anyone point me in the right direction? i have all the formulas but its not really helping :confused: . The problem is #3 on this link:

http://www.flc.losrios.edu/~landry/Coulomb_Practice.pdf
 
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Please, show your own work: https://www.physicsforums.com/showthread.php?t=94379

Start by writing down all the forces acting on the particles.
 
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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