You can model the surface charges on a small piece of wire using a ring of charg

Question

You can model the surface charges on a small piece of wire using a ring of charge (as all the charges exist on the surface of the wire). You can further simplify this model by representing the ring as point charges. The questions below ask about rings of charge(blue charges are positive and red charges are negative) Use the arrow figure to indicate the direction -C Consider a single ring of positive (blue) charges as shown a) In which direction would the electric field point in the middle of a ring of positive (blue) charges (point P)? Location P:v b) Which direction would the electric field point in the a distance d from the middle of a ring of positive (blue) charges (point R)? Location R:7

Explanation / Answer

a) Electric field at the center of a ring is always zero. The reason being the field from one side of the ring cancels the field from the other.

b) The electric field will point along the axis joining the point R that is it should act to the right ( C direction)

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