Induction
Positive Rod

Enrichment

Read About Faraday Cages in Wikipedia

A metal cage creates a shield against
very strong electric fields

University of Tehran High Voltage Lab. Person in cage: Prof. H.Mohseni

School blocks YouTube?
Use the file below.

Faraday_Cage.mov

Faraday Cage Protects from 100,000 V

Physikshow of the University of Bonn

Here's how it works

Stanisław Skowron

Conduction - Fill in the Blank Notes

3. Induction - Positive Rod

[ Flash ]

No charge is transferred

Electrons redistributed

Induction with a Positive Rod

Frame 1 - Neutral Electroscope

[ Flash ]

#p = #e-

Frame 2 - Rod comes near

[ Flash ]

Charge on electroscope?

#p = #e-

Electroscope is neutral

Charge of Knob (top)?

 Negative

[ Flash ]

Charge of Leaves?

Positive

Frame 3 - Rod Removed,
 Charges Return

[ Flash ] 

Electroscope is neutral

"What would happen  to the leaves of this electroscope if a positively charged rod were brought near the top of the electroscope?"

"Electrons would be attracted  up from leaves toward positive rod. Leaves would become more positive and diverge more."

"Which graphic shows the electron distribution of a neutral electroscope near a positive rod?"

Choice 4

"Electrons are attracted up towards the positive  rod"

Enrichment

Like a Bird on a Wire

Electricity, Height and Women

Clip from Straight Up:
Helicopters in Action from David Douglas on Vimeo.

Segment from the helicopter documentary "Straight Up!", showing power line
maintenance being performed on live wires by a man outside a helicopter, using a type of Faraday cage.

Like_a_Bird_on_a_Wire.mov