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A flat square sheet of thin aluminum foil, 40 cm on a side, carries a uniformly...

A flat square sheet of thin aluminum foil, 40 cm on a side, carries a uniformly distributed 380 nC charge.

a) What, approximately, is the electric field 2.0 cm above the center of the sheet?

b) What, approximately, is the electric field 16 m above the center of the sheet?

I'm not sure how to approach these problems. Please explain. Thank you.

science   physics   
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