A horizontal wire is tied to supports at each end and vibrates in its second-overtone standing wave. The tension in the wire is 5.00 N, and the node-to-node distance in the standing wave is 6.28 cm. (a) What is the length of the wire? (b) A point at an antinode of the standing wave on the wire travels from its maximum upward displacement to its maximum downward displacement in 8.40 ms. What is the wires mass?

PHY 184 Week 9 Notes-Magnetic Fields & Electromagnetic Induction 10/24-10/27 Moving charges produce a magnetic field o The Biot-Savart Law establishes this relation Wires produce a magnetic field o Can be seen by a compass near the wires μ d B= 0 ids×^ ⏞= ⃗ o 4π r2 ; r μ0 is the magnetic permeability of free space 4π 10 -7 To calculate B at P just integrate along the path Solving for B using symmetry gives B= μ0i o 2πd 2 Parallel Wires Consider a wire with current i a d1stance d away, with another wire nearby with current i .2 o They will attract Magnetic Force is given by F=i2L B1si