Unsolved Textbook Exercises: Seeking Help and Solutions

[arildno]

Post in detail how you get the answer in 6)

 

[kelvintc]

i got 4 for z=0 to z=2 for (z^2-1) then integrate get 2pie x r since r=2 then 4 times 4pie get 16pie

 

[arildno]

Ok, you've got two disks you've got to integrate over in 6)

a) The disk placed at z=2.
At that plane, we have :
\vec{F}\cdot\vec{n}=(z^{2}-1)|_{(z=2)}=3
Or, it's contribution is: 3*\pi(2)^{2}=12\pi

b) The disk placed at z=0
At that plane, we have:
\vec{F}\cdot\vec{n}=(1-z^{2})|_{(z=0)}=1
Or, it's contribution is: \pi(2)^{2}=4\pi

Is this how you thought?

 

[kelvintc]

ya... i did it like that

 

[kelvintc]

i had been doing these qs over the past few weeks and there are still some questions remained unsolved.. anyone can help ?
q3, 7, 8, 9, 13, 14, 15