Calculating the Average Current of a Rotating Charge q | Insulating String

  • Thread starter Thread starter eagleswings
  • Start date Start date
  • Tags Tags
    Weird
AI Thread Summary
The discussion revolves around calculating the average current of a rotating charge q on an insulating string. The key point is that while the charge does not change (dq/dt = 0), it still represents a current due to its circular motion. The average current can be derived from the relationship I = q/T, where T is the period of rotation. The equation I = qw/2π is suggested as a way to express the current in terms of angular frequency. The conversation highlights the confusion around the concept of current in this context, ultimately leading to a clearer understanding of the average current for a rotating charge.
eagleswings
Messages
15
Reaction score
1
[SOLVED] really weird one

Homework Statement

A small sphere that carries a charge q is whirled in a circle at the end of an insulating string. the angular frequencyy of rotation is omega [w]. What average current does this rotating charge represent?



Homework Equations

I = dQ/dt; w = 2(pi)/T; x[t] = Acos[wt +C];



The Attempt at a Solution

; this question doesn't make sense to me. q never changes - it just travels in a circle - so dq/dt =0;there is one charge going in a circle, but not axially which would represent charge in a conduit. is this a picture of alternating current? [we haven't gotten to that yet].
 
  • Like
Likes Shan promiz
Physics news on Phys.org
Current is the net charge per unit time passing a given point. On any point on the circumference, what is that value?
 
That would be qw = charge per second. surely not that simple. thanks
 
Should be q/T = qw/2pi.
 
thanks shooting star!
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Discharging a capacitor -- Calculate the current as a function of time
Replies
3
Views
2K
Average battery current in battery charger
Replies
7
Views
903
Finding the average energy in an RLC circuit
Replies
9
Views
2K
Find the charge q(t) for an LC circuit
Replies
2
Views
2K
Whats the average current does this rotating charge represent
Replies
5
Views
4K
Charge passing through a cross section for a time varying current
Replies
2
Views
4K
Calculating Heat Generated in a Coil due to Changing Current and Resistance
Replies
22
Views
6K
Foucault Pendulum at the North Pole
Replies
9
Views
2K
Energy dissipated by resistor problem
Replies
3
Views
3K
How Do You Calculate Current from a Single Oscillating Charge?
Replies
10
Views
3K

Hot Threads

Recent Insights

Back
Top