Differences

This shows you the differences between two versions of the page.

--- demonstrations:5_electricity_and_magnetism:5h_magnetic_fields_and_forces:repulsion:start [2019/02/14 23:33] – external edit 127.0.0.1
+++ demonstrations:5_electricity_and_magnetism:5h_magnetic_fields_and_forces:repulsion:start [2019/04/25 18:59] (current) – demoroom
@@ Line 1: / Line 1: @@
 ====== Wire Attraction/repulsion ======
-{{tag> needs_review untagged unlocated}}
+{{tag> high_current electricity_and_magnetism lorentz_force unlocated}}
 <WRAP box right>
@@ Line 11: / Line 11: @@
 ===== Description =====
-Demonstrates how wires with DC current flowing through them attract and repel each other depending on direction of current flow.
+Consists of a seven foot tall white wooden board with a base so it remains vertical. Attached to the top and bottom are two pairs of wires. One of them connected in series with each other, the the other in parallel. At the bottom are fixtures to attach the wires to a power supply.
-<span style="font-size:10pt;"><span style="font-size:10pt;"><span style="font-weight:bold;">
 ===== Purpose =====
+To demonstrate the formation of magnetic fields around currents and the resulting Lorentz forces, to show how wires with current flowing in the same direction attract while wires with current flowing in opposite directions repel.
-</span>To demonstrate how wires with current flowing in the same direction attract, while wires with current flowing in opposite directions repel.</span>
-<span style="font-size:10pt;"><span style="font-weight:bold;">
 ===== Apparatus =====
+  * Attraction/Repulsion setup (pictured)
-</span>Attraction/Repulsion setup
+  * High-current power supply: [[demonstrations:9_equipment:power_supplies:60a_current_supply:start|this]] or [[demonstrations:9_equipment:power_supplies:1000w_power_supply:start|this]] will work.
-Large power supply pictured below (located at the end of the workbench)
-<span style="font-weight:bold;">
 ===== Setup =====
+Plug in the power supply and connect the wires to the setup. Set the supply to output 60A and turn on briefly, for no longer than 3 seconds.
-</span>Plug in the power supply and connect the wires to the setup. Set powerstat to 60 and flip on.
-<span style="font-weight:bold;">Do not leave the power supply on for more than 3 seconds to prevent overheating!</span></span></span>
 ===== Notes =====
+Do not leave the power supply turned on for longer than 3 seconds at a time. Joule heating in the wire may begin to melt or burn the insulation.
 <WRAP group>