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Posted by on Thursday, February 17, 2011 at 11:40pm.

Consider the electric field created by a very long charged line of negative linear charge density -2.50 nC/m.

A small positive point charge of 12 mC moves from a distance of 7 cm to a distance of 18 cm.

In mJ, how much work is done by the electric field?

Hint: The electric field for a long charged line is

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