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Re: electromagnetism



Flux=B*area. No area was specified in question 1.

giustifamily wrote:

"The magnetic flux can not be calculated unless the
area is specified. But you can calculate the field:

B=mu_o*i/(2*pi*d)"

I disagree with this. Using trig, you can work out the radius of the B
field, then using the equation B= mu_0*I/(2*pi*r), the magnetic flux can be
calculated.
From this the magnetic field can be calculated using the formula H=B/mu_0.
do you agree or disagree?

----- Original Message -----
From: "kowalskil" <kowalskil@MAIL.MONTCLAIR.EDU>
To: <PHYS-L@lists.nau.edu>
Sent: Tuesday, April 16, 2002 10:42 PM
Subject: Re: electromagnetism

The question is :
an infinite straight xonductor running along the x-axis carries a current
of 50A in the positive direction. calculate the magnitude and direction
of
the magnetic flux and the magnetic field at point (5,4,4).

The magnetic flux can not be calculated unless the
area is specified. But you can calculate the field:

B=mu_o*i/(2*pi*d)

with i=50 A. You can derive this from the Biot
Savart law Note that d is the distance from your
point to the x axis, in meters.
Ludwik Kowalski

giustifamily wrote:

i cannot remember whether i have posted this question before but i have
done
most of it apart from the direction parts. i do not know how to work it
out.
i think when i posted it, one of you suggested the right hand rule. i
still
cannot seem to do it.
can any of you tell me how to do it.
the question is :
an infinite straight xonductor running along the x-axis carries a
current
of 50A in the positive direction. calculate the magnitude and direction
of
the magnetic flux and the magnetic field at point (5,4,4).

a second conductor of lenght 0.15m carrying a current of 3a in the same
direction is then placed at (5,4,4), parallel to the first. determine
the
magnitude and direction of the magnetic force acting on it?

here is what i have done:
sqrt=square root
r=sqrt(42+42)
=sqrt32

B=Uo*I/2*pi*r
=Uo*50/2*pi* sqrt32
=1.77pT

H=B/Uo
=1.4At/m

F=I*L*B
=3*0.15*1.77pT
=796.5nN

i think what i have done is correct so if any of you could help with the
direction i would be grateful
paul