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- 1. Multiple ChoiceA tiny sphere carrying a charge of 6.5 µC sits in an electric field, at a point where the electric potential is 240 V. What is the sphere’s potential energy?2.7 x 10-8 J6.5 x 10-6 J1.6 x 10-3 J240 J
- 2. Multiple Choice
An electron moves from point i to point f, in the direction of a uniform electric field. During this motion:the work done by the field is positive and the potential energy of the electron-field system increasesthe work done by the field is negative and the potential energy of the electron-field system increasesthe work done by the field is positive and the potential energy of the electron-field system decreasesthe work done by the field is negative and the potential energy of the electron-field system decreases - 3. Multiple ChoiceIf 500 J of work are required to carry a 40-C charge from one point to another, the potential difference between these two points is:12.5 V20,000 V0.08 Vdepends on the path
- 4. Multiple ChoiceThe potential difference between two points is 100 V. If a particle with a charge of 2 C is transported from one of these points to the other, the magnitude of the work done is:200 J100 J50 J2 J
- 5. Multiple ChoiceDuring a lightning discharge, 30 C of charge move through a potential difference of 1.0 x 108 V in 2.0 x 10–2 s. The energy released by this lightning bolt is:
1.5 x 1011 J
3.0 x 109 J
6.0 x 107 J
3.3 x 106 J
- 6. Multiple ChoiceA particle with mass m and charge –q is projected with speed v0 into the region between two parallel plates as shown. The potential difference between the two plates is V and their separation is d. The change in kinetic energy of the particle as it traverses this region is:–qV/d2qV/mv2qV1/2 mv2
- 7. Multiple Choice
Three particles having charges of +q, +Q, and -Q are placed at the corners of an equilateral triangle of side a, as shown below. The potential energy of the particle with charge +q due to the other two charges is _____.
zero
−2𝑘𝑄 /𝑎
−𝑘𝑄 𝑎
𝑘𝑄 𝑎
- 8. Multiple Choice
Two protons and an electron are assembled along a line, as shown below. The distance between the electron and each proton is 𝑎. What is the work done by an external force in assembling this configuration of charges?
−𝑘𝑒2/𝑎
−3𝑘𝑒2/2𝑎
−𝑘𝑒2/2𝑎
𝑘𝑒2/2𝑎
- 9. Multiple Choice
Three particles each with charge positive Q are placed on three corners of a square, as shown below. The sides of the square have length s. Point C is at the center of the square.
What is the direction of the electric field at point C?
↘
↙
→
←
- 10. Multiple Choice
If𝑎=30𝑐𝑚, 𝑏=20𝑐𝑚, 𝑞=+2.0𝑛𝐶, and𝑄= −3.0 𝑛𝐶 in the figure, what is the potential difference
𝑉A−𝑉B?
- 20 V
- 48 V
+60 V
+80 V
- 11. Multiple Choice
𝑾𝑬𝑿𝑻 is +, 𝑾𝑬LEC is -
𝑾𝑬𝑿𝑻 is +, 𝑾𝑬LEC is +
𝑾𝑬𝑿𝑻 is -, 𝑾𝑬LEC is +
𝑾𝑬𝑿𝑻 is -, 𝑾𝑬LEC is -
- 12. Multiple Choice
Two small spheres have charges +Q and –Q and
are located at the bottom corners of an equilateral triangle, as shown in the figure below. The equilateral triangle has sides of length a, and point P is at the top corner of the triangle.
The potential energy stored in the charge configuration shown is
𝑄2/ 4𝜋𝜀o𝑎
−𝑄2/ 4𝜋𝜀o𝑎
zero
−2𝑄2/ 4𝜋𝜀o𝑎
- 13. Multiple Choice
Two small spheres have charges +Q and –Q and
are located at the bottom corners of an equilateral triangle, as shown in the figure below. The equilateral triangle has sides of length a, and point P is at the top corner of the triangle.
The electric potential at point P due to the two spheres is
𝑄/ 4𝜋𝜀o𝑎
−𝑄/ 4𝜋𝜀o𝑎
zero
−2𝑄/ 4𝜋𝜀o𝑎
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