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Electric field

  1. Nov 23, 2007 #1
    The problem statement: Determine the maximum electric field on the axis of a ring of charge 4.3mC. The radius is 4cm.

    I think the key is to use ekvation 1 and derivate to determine the maximum electric field but I'm not sure. Q is the charge, x is axis of the ring, a is the radius. Any suggestion?

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    Last edited: Nov 23, 2007
  2. jcsd
  3. Nov 24, 2007 #2

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    Correct eqn. Differentiate and equate to zero to get the reqd x.
  4. Nov 24, 2007 #3
    instead of differentiate, I plot the function in an graph. accodring to the graph there is only on max point where x is approx 0.12m and the electric fields is 4.246*10^18N/C. The electric field is etremley high but since the charge of the ring is 4.3mC it is quite reasonable. Is it physical correct reason?
  5. Nov 24, 2007 #4

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    x= a/(sqrt 2) at the pt of maximum.
  6. Nov 24, 2007 #5
    now I get the same answer as you=), thanks alot!
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