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A test charge of 3.10 µC is placed 6.10 cm away from a large flat uniformly...

A test charge of 3.10 µC is placed 6.10 cm away from a large flat uniformly charged nonconducting surface. The force on the charge is 290 N. The charge is now moved to 4.10 cm away from the surface. What is the force on the test charge now?

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Answer #1
The electric field due of a large flat uniformly nonconducting charged surface is constant, so the force will still be 290 N.

This comes from Gauss's Law.
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