POTENTIAL Answer in the End of the Questions Section 19.1 Potential Energy Secti

Question

POTENTIAL Answer in the End of the Questions Section 19.1 Potential Energy Section 19.2 The Electric Potential Difference 1. Complete the following statement: The electron volt is a unit of (a) energy (b) electric field strength. (c) electric charge (d) electric potential difference. (e) electric power 2· Th e electric potential at a certain point is space is 12 V. What is the electric potential energy of a-3.0 HC charge placed at that point? (a) +4 HJ (b) -4 (e) zero uJ (c) +36 HU (d) -36 3. If the work required to move a +0.35 C charge from point A to point B is +125 J, what is the potential difference between the two points? (a) zero volts (b) 44 V (c) 88 V (d) 180 V (e) 360 V T-O +2.8 x 10-8 C 0.0025 m Two point charges are separated by 1.00 x 10-2 m. One charge is -2.8 x 10* C; and the other is +2.8 x 10 C. The points A and B are located 2.5 × 10.3 m from the lower and upper point charges as shown. 0.0050 m If an electron, which has a charge of 1.60 ×10-19 C, is moved from rest at A to rest at B, what is the change in electric potential energy of the electron? 4. 0.0025 m (a) +4.3 x 10-15 (b) +5.4 x 10-15J (c) -2.1×10-14J zero joules 0-28 x 10-8 C (d)-3.2 × 10-14 J 5. Which one of the following statements best describes the equipotential surfaces surrounding a point charge? (a) The equipotential surfaces are planes extending radially outward from the charge. (b) The equipotential surfaces are curved planes surrounding the charge, but only one passes through the charge. (c) The equipotential surfaces are concentric cubes with the charge at the center. (d) The equipotential surfaces are concentric spheres with the charge at the center. (e) The equipotential surfaces are concentric cylinders with the charge on the axis at the center.

Explanation / Answer

1) the electron volt (symbol eV; also written electronvolt) is a unit of energy equal to approximately 1.602×1019joule (symbol J). By definition, it is the amount of energy gained by the charge of a single electron moved across an electric potential difference of one volt

2)  A potential of 12V means that at that point a charge has an electrical potential energy of 12.0 Joules per Coulomb (J/C)
The EPE of a charge q .. E = qV
when q = -3.0C .. .. EPE = -3.0^-6C x 12J/C .. .. .. EPE = - 36^-6 J

3) work done = V*q
therefore V=125/.35=2500/7(almost =)360V

5)  The electric field of a point charge extends radially outward from the charge in all directions (or inward, depending on the charge). The equipotential surfaces are orthogonal to the electric field at each point, thus the equipotential surfaces are concentric spheres with the charge at the center.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.