# Could you help me with these questions?(Magnetic field and force)

1. Apr 22, 2004

Can any body help me with the solutions of one or more of these questions which are in the Book "University Physics 10th edition" chapter 28, questions: 1,4,9,13,29,57,58 Pleeeeeease

q1) A particle with a charge of -1.24 x 10(-8) C, is moving with instantaneous velocity v=(4.19x10(4) m/s)i + (-3.85x10(4) m/s)j.
What's the force exerted on this particle by a magnetic field
a) B = (1.40 T)i
b) B = (1.40 T)k?
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q4) A particle with a mass of 1.81x10(-3) kg and a charge of 1.22 x 10(-8) C has at a given instant a velocity v=(3.11 x 10(4) m/s)j. What are the magnitude and direction of the particle's acceleration produced by a uniform magnetic field B= (1.63 T)i + (0.980 T)j?
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q9)A circluar area with a radius of 6.50 cm lies in the xy-plane. What's the magnitude of the magnetic flux through this circle cue to a uniform magnetic field B = 0.230 T
a) in the +z direction?
b) at an angel of 53.1 from the +z-direction?
c)in the +y-direction?
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q13) An electron at point A in figure 38-39 has a speed v0 of 1.41 x 10(6) m/s. Find:
a) the magnitude and direction of the magnetic field that will cause the electron to follow the semicircular path from A to B;
b) the time requied for the electron to move from A to B.

vo
^
| /-----\
| / \
| / \
|/ \
O- v
A B
<--10.0 cm--->

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q29) A wire along the x-axis carries a current of 3.50 A in the naegative direction. Calculate the force (expressed in terms of unit vectors) on a 1.00 cm section of the wire exerted by these magnetic fields:
a) B= -(0.65 T)j;
b) B= +(0.56 T)k;
c)B= -(0.31 T)i;
d)B= +(0.33 T)i - (0.28 T)k;
e) B= +(0.74 T)j - (0.36 T)k.

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and also who has the same book can help me with questions 57 and 58

I hope to answer these questions today or tomorrow! :(

2. Apr 22, 2004

### Staff: Mentor

Show us what you've done so far and where you got stuck.

3. Apr 22, 2004

I want full answer/s for these questions, so I can practising on solving them!

because the physics exam is coming soon!

4. Apr 22, 2004

Or, If you know a website that offers solutions for this book, I'll be glad!

5. Apr 22, 2004

### Staff: Mentor

Good one!

6. Apr 22, 2004

Yes, It's a good one?!
it's not my home work! Infact, our teacher tells us that the exam in this chapter will be in Only these questions! I'm not lying, I want to practise only!

7. Apr 22, 2004

### KingNothing

Unless you have tests where you sit and watch someone else do them, us doing it all isn't very good practice.

8. Apr 24, 2004

KingNothing, You are right .. You are the king of Nothing!,
Anyway, I solved all the problems myself except q57 and 58, and fortunately, Our teacher said leave them!

Thanks you guys for HELPING ME
I will think one thousand times before asking another question in this forum!

and by The way, I'm not specialist in physics, and thanks for god I didn't choose it! it's driving me crazy! or monkey .. Whatever! hope you guys enjoying it

GOOOD BYE