a student stands on a piece of insulating material, places her hand on top of a Van de Graaff generator and then turns the generator on. why doesnt she receive a shock? what would happen if she had sweaty feet, thin-soled shoes and was standing on a damp floor?
Student stands on insulating material places her hand on Van de Graaff generator turn it on why isnt she shock
She doesn't receive a shock because the electricity wants to get to the ground. The insulating mat prohibits this, so it won't flow. If she was in the second scenario and touched it, then she would be shocked (assuming the absence of the insulating mat).
Reply:the person is not shocked in the first instance because she is not grounded, meaning that the electricity has no way of reaching the ground using her, however in the second instance she would be shocked so long as the charge on the generator was high enough to travel through her skin and her shoes had a thin enough sole (most likely in the sanario described)
Reply:a path for the charge to go to ground is needed. the isulating material prevents this. If she did have sweaty feet (P-U) then she would have a shock.
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