Magnetic field around spinning sphere

AI Thread Summary
The discussion centers on determining the magnetic field generated by a positively charged, spinning sphere with its angular velocity vector directed upwards. The user expresses uncertainty about visualizing the magnetic field lines both inside and outside the sphere. They seek clarification on the relevance of equations related to moving charges, particularly questioning the necessity of calculations for simply drawing the magnetic field. The focus is on conceptual understanding rather than mathematical computation. Overall, the thread emphasizes the need for guidance in visualizing magnetic fields in this specific scenario.
ninjadrummer8
Messages
24
Reaction score
0

Homework Statement



So there's a sphere, and it has a positive charge on it. The sphere is spinning, and the angular velocity vector is pointing up through the top. What does the magnetic field look like inside & outside the sphere?

qu1.jpg

Homework Equations



none

The Attempt at a Solution



This is what I think it looks like outside of the sphere, but I'm not sure what it would look like inside...

qu2.jpg
 

Attachments

  • qu1.jpg
    qu1.jpg
    2.8 KB · Views: 463
Physics news on Phys.org
Which equation do you use to figure out the magnetic B-field due to moving charges (current)? That is certainly a Relevant Equation for this problem.
 
F=qvBsin(theta) ?

I don't see how this is relevant though, since I am not asked to calculate anything, simply draw in the magnetic field lines
 
can anyone tell me if I am thinking about this right? i don't need any equations I just need to be able to draw the magnetic field
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
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}...
View full post »

Similar threads

Magnetization of a paramagnetic sphere
Replies
11
Views
2K
Electric field external to Conducting Hollow Sphere with charge inside
Replies
23
Views
3K
Work done to insert a point charge 𝑞 at the center of a conducting sphere
Replies
12
Views
1K
Flux of Electric field through sphere
Replies
2
Views
2K
Should I Consider the Electric Field Outside a Uniformly Charged Sphere?
Replies
2
Views
3K
Spin of a charged sphere in a non-uniform magnetic field
Replies
19
Views
3K
Find magnetic field at center of rotating sphere
Replies
9
Views
2K
Charge density in sphere that makes constant radial E-field inside
Replies
14
Views
2K
Understanding the Electric Field of a Charged Sphere
Replies
8
Views
3K
Does a Bent Wire Affect Induction Calculations?
Replies
7
Views
2K

Hot Threads

Recent Insights

Back
Top