H2P-392
Electric field and potential gradient
H2 Physics · JC 2 · Hard · Electric field and potential gradient
An electron of charge −e moves from a point at 15 V to a point at 45 V. Its kinetic energy at the first point is 3.0×10⁻¹⁹ J. What is its kinetic energy at the second point?
- 5.1×10⁻¹8 J
- 4.5×10⁻¹8 J
- 1.8×10⁻¹8 J
- 1.5×10⁻¹9 J
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