2- In the figure below four light bulbs are shown as resistors. The bulb that is labeled as has resistance 2R. The other bulbs all have the same resistance, R. ‘3’ The source has 110 [V]. Which statements about the situation are true? Mark each statement as T for true or F for false. A- Bulb and shine with the same brightness when switch is open. ‘1’ ‘2’ ‘S’ B- Bulb and experience the same potential difference when is open. ‘2’ ‘4’ ‘S’ C- When is open the equivalent resistance is 1.5 R. ‘S’ D- When switch is closed and get darker. ‘S’ ‘1’, ‘2’, ‘4’ 3- Starting from the definition of resistivity, derive the general expression for resistance. 4- Show why any spherical charge distribution looks from the outside like a point charge at its center.
2- In the figure below four light bulbs are shown as resistors. The bulb that is labeled as ‘3’ has resistance 2R. The other bulbs all have the same resistance, R. The source has 110 [V]. Which statements about the situation are true? Mark each statement as T for true or F for false. A- Bulb ‘1’ and ‘2’ shine with the same brightness when switch ‘S’ is open. B- Bulb ‘2’ and ‘4’ experience the same potential difference when ‘S’ is open. C- When ‘S’ is open the equivalent resistance is 1.5 R. D- When switch ‘S’ is closed ‘1’, ‘2’, and ‘4’ get darker. 3- Starting from the definition of resistivity, derive the general expression for resistance. 4- Show why any spherical charge distribution looks from the outside like a point charge at its center.
S16_1220Exam1.docx