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PRACTICE / Fields of continuous charge distributions

Sum a ring without losing direction

A thin ring of radius 0.30 m carries uniform positive charge Q. For this charge, keQ = 25 V·m. A point lies on the ring axis 0.40 m from its center.

Find the electric-field magnitude at that point.

Organize the givens & assumptions
  • Ring radius a = 0.30 m
  • Axial position x = 0.40 m
  • keQ = 25 V·m

Uniform static charge on the ring in vacuum; axis point at positive x; ring thickness negligible.

  1. A80 V/m80\ \mathrm{V/m}
  2. B100 V/m100\ \mathrm{V/m}
  3. C156.25 V/m156.25\ \mathrm{V/m}
  4. D0 V/m0\ \mathrm{V/m}

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