An electron with a speed of v=10×107 m/s enters an electric field of magnitude E=1×103 N/C, traveling along the field lines in the direction that retards its motion. It takes the electron 5.688E-7 s to stop. How far will the electron travel in the field before stopping momentarily?

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A: Answer:20m/s Options are incorrect.

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A: Explanation and solution shown in the picture below ?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.