C01 Electric Force

It is quite challenging to build up static charges in Singapore. Because of the humidity. The H2O molecules in the air keep removing the charges from any charged surface.

Even the Van der Graaff generator in my school lab cannot quite make the hair stand. All it can do is throw off some aluminium cups.

See detail at https://xmdemo.wordpress.com/101

One trick that electric charges can pull that masses cannot is this: a charged body can induce charges on other bodies. Even initially neutral bodies can start attracting or repelling each other after they have exchanged charges!

See how the Van der Graaff generator makes itself attractive by inducing (unlike) charges on aluminium foils, and then repulsive by conducting (like) charges onto the foils.

See detail at https://xmdemo.wordpress.com/100

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