Webassign Find Strength of Magnetic Field using Java App

AI Thread Summary
The discussion focuses on calculating the strength of a magnetic field for a 10nC, 1µg particle using the equations f = mv²/r and F = qvb. The original poster expresses confusion over their solution, while another participant points out the importance of using proper SI units in calculations. They note that the calculated magnetic field strength of 78 T is excessively high, suggesting a potential error in unit conversion. Proper unit conversion is emphasized as crucial for accurate results. The conversation highlights the need for careful attention to units in physics problems.
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Homework Statement



A 10nC, 1µg particle is fired into a magnetic field as shown. Distances are in millimeters, time is in seconds. What is the strength of the field? (See my picture for additional information and my worked solution)


Homework Equations


f= mv^2 /r F(from B field) = qvb


The Attempt at a Solution


see picture for my work. I don't see what I am doing wrong.

DangIt.jpg
 
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Hello Erwin,
Wow, you sure have a wide screen. Doesn't prevent you from falling into the trap of forgetting to use proper units. Your expression for B is quite correct. Convert one of the factors to SI units and you are in business.

Hint: 78 T is incredibly huge for a magnetic field strength.
 

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...
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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...
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