1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Static Electricity

  1. Mar 31, 2008 #1
    You rub your feet on the carpet in your warm living room on a cold winter day. You know you have gained static electrical charge on your body. You decide to touch your sister to shock her. Your sister knows that in order to reduce the electrical shock she will feel when you touch her, she
    (A)must stand very still
    (B) hold on to a doorknob
    (C)jump up and down at exactly 60 Hertz
    (D)rub her feet on the carpet

    I have narrowed this down to answers B and D. I am leaning toward answer B, because if the sister rubs her feet on the carpet, as in answer D, there still might be a charge differential between the two people and therefore there would still be a shock. I think, but am not sure, that B would "ground" the charge. Please help!
  2. jcsd
  3. Mar 31, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    If (B) would ground her, she would still get a shock, right? As would you, so that might be ok. Suppose she could charge herself up to the same potential as you? Then what would happen? How might she do this? I think you know the correct answer.
    Last edited: Mar 31, 2008
  4. Mar 31, 2008 #3
    I'm just confused because even if she rubs her feet on the carpet, there is no guarantee that she will charge herself to the same potential as you.

    On a related note, when you ground yourself you produce an electric shock? Does this occur because you are transferring a charge back to the earth?
  5. Mar 31, 2008 #4


    User Avatar
    Science Advisor
    Homework Helper

    Nope, no guarantee. But the less the potential difference, the less the shock. Shocks are mutual, the same current passes through both parties. The trick to shocking someone is that you expect it and they don't. It's largely psychological. Grounding one doesn't make much difference.
  6. Mar 31, 2008 #5
    True, but your original question said "reduce" not eliminate.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Static Electricity
  1. Static Electricity (Replies: 7)

  2. Static electricity (Replies: 6)

  3. Static Electricity (Replies: 2)

  4. Static electricity (Replies: 3)