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Chapter 30 - 30.26

26. Using Eq. 30-15, the force on, say, wire 1 (the wire at the upper left of the ﬁgure)is along the diagonal

(pointing towards wire 3 which is at the lower right). Only the forces (or their components) along the

diagonal direction contribute. With θ =45 ◦ , we ﬁnd

F 1 =

cos 45 ◦ +

µ 0 i 2

2 √ 2 πa

=0 . 338 µ 0 i 2

F 12 + F 13 + F 14

=2 F 12 cos θ + F 13

=2 µ 0 i 2

2 πa