Recent content by Caiti

  1. C

    Electric Field due to Point Charges

    So does that mean that if we were finding the electric field, not magnitude, I would be correct? Or would I still use E=k[((5x10-6)/0.362)+((2x10-6)/0.142)] , then choose direction afterwards?
  2. C

    Electric Field due to Point Charges

    Homework Statement [/B] The following is on a practice exam I have been completing. In advance, it is part b I am struggling with. Two point charges Q1 = +5*10^(-6)C and -2*10^(-6)C are 50cm apart. a) Where along a line that passes through the two charges is the electric potential zero (apart...
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    Definition of Convergence: Can n -> -infinity

    Homework Statement I've been given a question that makes use of 5^(n)*sin(pi*n!) The question merely asks if the sequence converges, and if so, to determine its limit. Am I right in assuming that this does converge, under the definition, but does so as n-> - infinity? So basically, I...
  4. C

    Finding the limit of a sequence

    I think it would go to e. Thanks for your help!
  5. C

    Finding the limit of a sequence

    Homework Statement How do you determine if the limit of (1+1/n^2)^(n^2) exists and what it is? This cannot use logarithms at any point. Homework Equations (1+1/n)^n --> e The Attempt at a Solution Let N=n^2 Given (1+1/N)^N --> e, then (1+1/n^2)^(n^2) must --> e also. Is...
  6. C

    Electric field inside at points on a conductive box

    Here's a copy of an image explaining where the points are. It has them labelled as 1, 2 and 3, but I used a, b and c respectively. So with point c, inside, it is determined by point b? I'm sorry, but I don't fully understand Thank you (=
  7. C

    Electric field inside at points on a conductive box

    Homework Statement I'm having trouble understanding a concept. Given a conducting box with point a located outside the box, point b located within the (thick) wall of the box and point c located within the cavity of the box, I have to calculate the electric field at each of these...
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    Appropriate arrangement of light meter circuit with LDR and resistor question:

    Hey, While I totally agree with your comment, this is a question I've pulled straight from a book of them - and there is definitely no additional information there. I'm assuming the exact way of measuring light was to be disregarded; however I'm obviously not certain about this.
  9. C

    Appropriate arrangement of light meter circuit with LDR and resistor question:

    Homework Statement If you have a series 'light-meter' circuit with a cell EMF of 12V that must include both an LDR and a resistor only (in series), which way would you put them around to make this most effective and why? ~~~That is, would you have LDR then resistor, or resistor then LDR...