A square insulating sheet 90.0 cm on a side is heldhorizontally. The sheet has 8.50 nC of charge spread uniformly overits area.

1.Calculate the magnitude of the electric field at a point 0.100mm above the center of the sheet.

2.Estimate the magnitude of the electric field at a pointlocated a distance 200 m above the center of the sheet.

E = 5.46×10−5 N/C
E = 2.39×10−4 N/C
E = 1.91×10−3 N/C
E = 2.68×10−2 N/

3. Would the answers to parts A and B be different if the sheetwere made of a conducting material? Select the correct answer andexplanation.

The charge would automatically spread out evenly over bothfaces, giving it half the charge density on either face as theinsulator and the same electric field only close to the sheet. Theanswer to part A would not change, but the answer to part B wouldchange.
The charge would automatically spread out evenly over both faces,giving it half the charge density on either face as the insulatorand changing the sign of the electric field. Both answers wouldchange.
The charge would automatically spread out evenly over both faces,giving it half the charge density on either face as the insulatorand changing the electric field. Far away, they both look likepoints with the same charge. The answer to part B would not change,but the answer to part A would change.
The charge would automatically spread out evenly over both faces,giving it half the charge density on either face as the insulatorbut the same electric field. Far away, they both look like pointswith the same charge. Neither answer would change.