A ring of charge of radius ro lies in the xy plane with its center at the origin. The charge counterclockwise from θ = 0° to θ = 180° is uniformly distributed with the total charge equaling Q. The charge counterclockwise from θ = 180° to θ = 360° is uniformly distributed with the total charge for this half of the ring equaling −Q.

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A ring of charge of radius ro lies in the xy plane with its center at the origin.

The charge counterclockwise from θ = 0° to θ = 180°  is uniformly distributed with the total charge equaling Q.

The charge counterclockwise from θ = 180° to θ = 360°  is uniformly distributed with the total charge for this half of the ring equaling −Q.

 

What is the direction of the electric field on the z-axis at the position (x, y, z) = ( 0, 0, ro ) ? 

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