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The electric field strength 30 cm from the center of a charge Q is 380 N/C. An electron is fired away from the charge Q

The electric field strength 30 cm from the center of a charge Q is 380 N/C. An electron is fired away from the charge Q with speed 740 km/s at a distance x from Q. The electron will turn around at a distance 2.0 m from Q.

What is the magnitude and sign of charge Q?

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