A constant electric field with magnitude 1.50 ✕ 103 N/C is pointing in the positive x-direction. An electron is fired from  x = −0.0200 m  in the same direction as the electric field. The electron's speed has fallen by half when it reaches  x = 0.170 m,  a change in potential energy of 4.56 ✕ 10−17 J. The electron continues to  x = −0.250 m  within the constant electric field. If there's a change in potential energy of −1.01 ✕ 10−16 J as it goes from  x = 0.170 m  to  x = −0.250 m,  find the electron's speed (in m/s) at  x = −0.250 m.

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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.