Observing the Electric Field of a +4.3µC Charge

AI Thread Summary
The discussion focuses on observing the electric field generated by a +4.3 µC point charge. It emphasizes that electric field lines radiate outward from positive charges, indicating their direction. Participants express uncertainty about the quantity of lines to draw, noting that while a higher charge typically results in more lines, the exact number may not be critical for understanding the concept. The consensus is that the key is to demonstrate comprehension of the field's general appearance rather than precise line counts. Overall, the discussion reinforces the fundamental principles of electric fields around positive charges.
arabianchick
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1.You are observing the effects of a single point charge with magnitude of +4.3 µC.



2. Draw a diagram of the electric field around this charge. Be sure to indicate the direction of electric field lines.



3. I know that the lines will point away from the charge because it is positive but i don't know how many lines to put. because it says that if its positive but the charge is high there will be a lot more lines. how do i know how many lines to put??
 
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In these types of problem I don't think it matters about the number of lines since all you're supposed to do is show you understand what the field lines around a positive point charge look like.
 
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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