Electrostatics - Compute the electric charge

AI Thread Summary
The discussion revolves around calculating the electric charges of three point charges arranged in a triangle, with specific numbers of extra or removed electrons assigned to each charge. Charge q1 has 4.5 x 10^13 extra electrons, q2 has 9.0 x 10^13 extra electrons, and q3 has 9.0 x 10^13 electrons removed. Participants mention using the formula V = u/q to find the charge but express difficulty in applying it correctly. A reminder to look up the charge per electron is provided, indicating a need for foundational knowledge in electrostatics. The conversation highlights the importance of understanding basic concepts to solve the problem effectively.
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Homework Statement


three point charges q1,q2&q3 are place at the vertices of triangle as shown in the diagram charge q1 has been given 4.5 X 10^13 extra electrons, charge q2 given 9.0 X10^13 extra electrons and q3 has had 9.0 X 10^13 electrons taken from it. Calculate the electric charge of q1,q2,&q3?


Homework Equations


no,sorry..

3. The Attempt at a Solution [
1stly i use the formula V=u/q to find the charge but it doesn't work,so I'm stuck with it!
 
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What's the charge per electron? (Look it up.)
 


Doc Al said:
What's the charge per electron? (Look it up.)

ohh..ya,i wasn't realize about it..thanks for the hint,mentor..thanks alot..=>
 
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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