Calculating Blood Velocity from Voltage Difference

AI Thread Summary
To calculate blood velocity from the given voltage difference and magnetic field, the relevant equations include V = kq/r, E = kq/r^2, and v = E/B. The user is uncertain about correctly applying these equations, particularly in determining the electric field (E) and how voltage (V) factors into the calculations. Clarification is needed on whether to use the entire diameter of the artery or half for the radius (r) and whether to apply the charge of an electron or proton for q. The user also expresses confusion about the relationship between voltage and induced electromotive force (emf). Understanding these concepts is crucial for accurately calculating the blood velocity.
map7s
Messages
145
Reaction score
0

Homework Statement



An artery has an inside diameter of 3.20 mm and passes through a region where the magnetic field is 0.065 T.
If the voltage difference between the electrodes is 155 µV, what is the speed of the blood?

Homework Equations



V=kq/r E=kq/r^2 v=E/B

The Attempt at a Solution



I know that I have to ultimately use the last equation to find out velocity, but I need to first find out E. I tried using the second equation, but I am not quite sure as to what I'm doing wrong. First of all, is that right equation? For q, am I supposed to use the charge of an electron/proton? is r supposed to be entire diameter or should I divide it half?
 
Physics news on Phys.org
Remember that V is a scalar and E is a vector. They are related somehow or another...
 
There is a simple equation for induced emf that applies here
 
In my calculations I wasn't able to include V, but I know that I should. However, I don't know how the two relate to each other in an equation...Also, I don't think that I've learned about emf...
 

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

Blood flow velocity via Doppler effect
Replies
1
Views
2K
How Do You Calculate Shear Stress in a Coronary Artery?
Replies
2
Views
2K
Calculating blood pressure increase with Poiseuille's equation
Replies
1
Views
6K
Calculate the maximum voltage that can be applied
Replies
5
Views
2K
What is the Maximum Constriction Radius in the Artery Given These Conditions?
Replies
1
Views
2K
Finding the energy density outside of an isolated charged sphere
Replies
3
Views
3K
Voltage using different references
Replies
4
Views
1K
How Much Voltage Is Needed to Suspend Charged Water Droplets?
Replies
5
Views
1K
Strength of electric field given potential difference
Replies
4
Views
6K
Why Is Work Positive When Done Against the Electric Field?
Replies
22
Views
3K

Hot Threads

Recent Insights

Back
Top