The electric field 12.0 cm from the surface of a copper ball of radius 9.0 cm...

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The electric field 12.0 cm from the surface of a copper ball of radius 9.0 cm...

The electric field 12.0 cm from the surface of a copper ball of radius 9.0 cm is directed toward the ball's center and has magnitude 3.0 ✕ 10² N/C. How much charge is on the surface of the ball (in C)? (Include the sign of the value in your answer.)

the answer is NOT -1.97E-9

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