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Homework Help: Basic question on resistance

  1. Jan 25, 2009 #1
    1. The problem statement, all variables and given/known data
    http://www.ocr.org.uk/Data/publications/past_papers_2005_june/L_AS_Level_Physics_A_2822_Jun_2005_Question_paper.pdf [Broken]

    Question 5


    2. Relevant equations



    3. The attempt at a solution

    For a) I put that because the circuit isn't closed there's no current.

    for b) I can see that the total resistance would be the sum of
    [itex]168k\Omega + R_2[/itex]

    [itex]R = \frac{V}{I}[/itex]
    [itex]R = \frac{3.4}{I}[/itex]

    I don't know the current. I'm new to this so I don't really know how to solve. I think an example would help.
     
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Jan 25, 2009 #2
    You have enough information to get current across the resistor.
     
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