P30_061 - 61(a We find the field by superposing the...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 61. (a) We find the field by superposing the results of two semi-infinite wires (Eq. 30-9) and a semicircular arc (Eq. 30-11 with φ = π rad). The direction of B is out of the page, as can be checked by referring to Fig. 30-6(c). The magnitude of B at point a is therefore Ba = 2 µ0 i 4πR + µ0 iπ µ0 i = 4πR 2R 1 1 + π2 . With i = 10 A and R = 0.0050 m, we obtain Ba = 1.0 × 10−3 T. The direction of this field is out of the page, as Fig. 30-6(c) makes clear. (b) The last remark in the problem statement implies that treating b as a point midway between two infinite wires is a good approximation. Thus, using Eq. 30-6, Bb = 2 This field, too, points out of the page. µ0 i 2πR = 8.0 × 10−4 T . ...
View Full Document

This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

Ask a homework question - tutors are online