Recent content by RedLego

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    What is the focal length of the lens? given magnification and distance

    Homework Statement A biology student wishes to examine a bug at a magnificaiton of +5.00 by looking through a single lens. the student wants the image of the bug to be a distance of 25cm from the lens. what is the focal length of the lens? Answer:+6.25cm Homework Equations...
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    Given charge of uniform density. What is the electrical potential @?

    OHH! haha thanks i got it now :) 4.50nC/m * 2pi * k = 254.5V
  3. R

    Given charge of uniform density. What is the electrical potential @?

    Homework Statement Charge of uniform density 4.50nC/m is distributed along the circle of radius R. What is the electrical potential (relative to zero at infinity) at the centre of the circle? Answer: 254V Homework Equations electric potential: V=kQ/r The Attempt at a Solution Because the...
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    What is the change in the proton's electric potential energy?

    :) Arn't you fantastic! Thank you sir!
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    What is the change in the proton's electric potential energy?

    Homework Statement A proton moves in a constant electric field E from point A to point B. the magnitude of the electric field is 6.4x10^4 N/C. The direction of electric field is opposite to the motion of the proton. If the distance from point A to point B is 0.50m, what is the change in the...