The figure to the right shows a uniform magnetic field. We would like to run an

Question

The figure to the right shows a uniform magnetic field. We would like to run an infinite straight wire through the point A carrying a current I so that the total magnetic field at the point P is zero. In what direction should the current run through point A? Select One of the Following: into the page out of the page to the left of the page the right of the page to the top of the page to the bottom of the page A half loop of wire centered at the origin occupies the +x portion of the x- y plane. A current I flows counter-clockwise when viewed from the +z side of the plane. The radius of the half loop is 3cm and the loop carries a current of '2A. Compute the magnetic field at the origin. select One of the Following: +2.1 x 10^5T2 -2.1 x 10^-5TZ +4.2 x 10^-5Tz -4.2 x 10^-5Tz 0

Explanation / Answer

11.4 .. to the bottom of the page

as net B due to existing wires is in out of the page so in order to get net B = 0 we must have current in downward direction.

11.5

B = u0NI/2R ( N = 1/2 in this case)

=> B = (4*3.14*10^-7*1/2*2)/(2*3*10^-2) = 0.0000209 out of the plane

hence option A

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