How many electrons would you need
- How many electrons would you need to add to a sphere to give it a charge of −2.00 × 10−10 C? How could you give the sphere a positive charge? 2. Two spheres are set up as shown in the diagram. For each of the following cases calculate the force that Sphere B applies on Sphere A. Calculate the magnitude of the force and state whether it is attractive (to the right) or repulsive (to the left). a) Sphere A has charge Q = +1.0 C, Sphere B has charge Q = +1.0 C and r = 2.0 m. b) Sphere A has charge Q = +1.0 C, Sphere B has charge Q = −1.0 C and r = 2.0 m. c) Sphere A has charge Q = −2.0 C, Sphere B has charge Q = −0.50 C and r = 3.0 m. d) Sphere A has charge Q = −0.75 C, Sphere B has charge Q = +3.0 C and r = 1.0 m. 3. Describe the differences between a conductor and insulator and give 2 examples of materials that fit into each of these categories. 4. Calculate the current flowing through a wire if 2.0 × 1020 electrons flow through the wire in one minute. 1 2 HOW DOES A STREET LAMP WORK? 5. Calculate the current flowing through the circuit in the diagram. 6. This question refers to the circuit diagram shown below. a) Are the resistors in this circuit in series or in parallel? b) Calculate the voltage drop across R1. c) Calculate the voltage drop across R2. d) Calculate the current flow through R1. e) Calculate the current flow through R2.
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