Find Magnetic Force: Electron & Proton

AI Thread Summary
The discussion focuses on calculating the magnetic force on an electron and a proton moving through a uniform magnetic field. The user initially calculated the magnetic force for both particles, obtaining a force of 7.112e-14 for the electron and -7.112e-14 for the proton. However, the homework website flagged the proton's answer as incorrect due to not taking the absolute value of the force. The realization that the question asked for the magnitude of the force led to the correction of the error. This highlights the importance of carefully reading homework questions to avoid mistakes.
Medtner
Messages
12
Reaction score
0

Homework Statement


An electron that has a velocity with x component 2.1 × 106 m/s and y component 3.1 × 106 m/s moves through a uniform magnetic field with x component 0.035 T and y component -0.16 T. (a) Find the magnitude of the magnetic force on the electron. (b) Repeat your calculation for a proton having the same velocity.

Homework Equations


Fb=qVxB
q(VxBy-ByBx)

The Attempt at a Solution


I did the work, got an answer for part A which is 7.112e-14
Did the exact same procedure for part B and arrived at -7.112e-14, but the homework website is telling me it's wrong?! Not sure what my error is...
 
Physics news on Phys.org
The question asks for the magnitude of the force.
 
*facepalm*

Silly me, I should read questions more carefully. Forgot to absolute value on both parts, only with a it work out by luck! Thanks.
 
OK, good.
 

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

What is the Correct Way to Calculate Magnetic Force on an Electron or Proton?
Replies
7
Views
2K
Find the magnitude of the electromagnetic force on electron?
Replies
3
Views
2K
What is the induced magnetic force on this closed current loop?
Replies
12
Views
2K
Proton vs electron, find the magnetic field for the electron
Replies
9
Views
2K
(Magnetism) Magnetic pull force on a steel ball
Replies
4
Views
2K
Determining the magnetic force on an electron
Replies
3
Views
2K
Find the equation of this magnetic field
Replies
6
Views
1K
An electron & a proton are each placed in an electric field
Replies
1
Views
3K
Magnetic Field Force of a proton
Replies
6
Views
2K
Find the electric field on a proton by an electron
Replies
15
Views
6K

Hot Threads

Recent Insights

Back
Top