SOURCE

FIELD STRENGTH E (N.C^-1 or V.m^-1)

Background radiation in space

3x10^-6

In house wires

0.01

Radio waves

~ 0.1

Outside an electrified building

~ 0.1

Centre of a typical living room

~ 3

In a fluorescent tube

10

30 cm from an electric clock

15

30 cm from a stereo

90

Laser beam (low power0

100

Atmosphere (fair weather)

~ 250

30 cm from electric blanket

250

Built up by splashing water in a shower

800

Sunlight (average)

10³

Atmosphere (thunder storm)

10⁴

Van de Graaff generator

2x10⁶

Breakdown of air

3x10⁶

X-ray tube

5x10⁶

At cell membrane

10⁷

At electron in hydrogen atom

6x10¹¹

Surface of a pulsar

~10¹⁴

Surface of uranium atom

2x10²¹