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A straight, nonconducting plastic wire 7.00 cm long carries a charge density of 125 nC/m distributed...

A straight, nonconducting plastic wire 7.00 cm long carries a charge density of 125 nC/m distributed uniformly along its length. It is lying on a horizontal tabletop.

- Find the magnitude and direction of the electric field this wire produces at a point 4.50 cm directly above its midpoint.

- Is the electric field directed upward or downward?

- If the wire is now bent into a circle lying flat on the table, find the magnitude and direction of the electric field it produces at a point 4.50 cm directly above its center.

- Is the electric field directed upward or downward?

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