Astraight, nonconducting plastic wire 9.50 cm long carries a charge density of 135 nc/m distributed uniformly along its length. it is lying on a horizontal tabletop.

a) find the magnitude of the electric field this wire produces at a point 4.00 cm directly above its midpoint.

b) find the direction of this electric field.

c) 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 4.00 cm directly above its center.

d) find the direction of this electric field.