Electricity and Magnetism > Inductance DCS# 5J10.20
BACK EMF
set-up for back emf demo
APPARATUS
big inductor 202-20-F
pair of copper paddles 202-20-F
6 V battery 202-02-D1

DESCRIPTION
Place paddles in contact for a few seconds and then separate them quickly to produce a big spark.

 
NOTES

Clean copper paddles with steel wool before using.

A neon bulb connected across the inductor will light when the switch (or pair of paddles) is opened.