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Electrocution / Lighting / Earthing / etc

Right, a few related questions....


You only get electrocuted when the current passes through your body, right?
So, if you're earthed, then the electricity will pass through you, and electrocute you.

But if you're (say) standing on a polystyrene box, and touch an electric fence, you won't get affected; is that correct?

If so, then:

 1- Is that to say that if you were in the air, and got struck by lightning, then you wouldn't be electrocuted?
     This seems somewhat absurd, so I'm guessing there's some factor I'm missing here?

 2- When a plane is struck by lightning, does the current pass through the plane?
     If so, then how? Where does it go?
     If not, then also, where does it go? Does the plane store it?


Another question-- about lightning:

 3- How does electricity in a thunder cloud decide which object to strike?
     Is it the tallest one? The better conductor? A bit of both?



Thanks
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So if you're in the air, it will still hit the earth? (ie., go through you, and then into the earth)?
And it's the same thing for planes?
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