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9) The practical limit to an electric field in air is about 3.00 x 10 N/C. Above this strength, sparking takes place because air begins

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9) The practical limit to an electric field in air is about 3.00 x 10 N/C. Above this strength, sparking takes place because air begins to ionize and charges flow, reducing the field. a) Calculate the distance a free proton must travel in this field to reach 5.00% of the speed of light, starting from rest. (10 pts.) b) Is this practical in air, or must it occur in a vacuum? Explain. (2 pts.)

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