q9_sol_c28 - Quiz 9 Phys. 2306 F09 You may use your text...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Quiz 9 Phys. 2306 F09 You may use your text book, notes, and a calculator. Three infinitely long wires run from -∞ ≤ z ≤ ∞ and carry currents of mag- nitude I. The current in wire 1 that passes through the point (x,y) = (0,a) flows in the +z direction, the current in the wire 2 that passes through the point (x,y) = (0,-a) flows in the -z direction, and the current in wire 3 that passes through the point (x,y) = (b,0) flows in the -z direction. 1) What is the direction of the magnetic field at wire 3? a) +x b) -x c) +y d) -y e) none of these Choose the x,y,z axes i , j , k in the following directions: right, up, out of pa- per. Wires 1 and 2 are both a distance d = a 2 + b 2 from wire 3. Thus the fields at wire 3 have equal magnitudes, B = μ 0 I 2 πd . However, they point in different directions. The directions of the field lines from each wire are concentric circles about wires 1 and 2. So draw a circle of radius d with centers at wire 1 and 2 and where the circles intersect wire 3 draw the tangents in the correct sense. For wire 1, B
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/24/2011 for the course PHYS 2306 taught by Professor Ykim during the Fall '06 term at Virginia Tech.

Page1 / 2

q9_sol_c28 - Quiz 9 Phys. 2306 F09 You may use your text...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online