1. Important: Mark the answer to question 1 as ( D ). 2. In the circuit shown below, ( mathrm{R}_{1}=250 Omega ) and ( mathrm{R}_{2}=750 Omega ). What is the reading of the voltmeter? A. ( 16.0 mathrm{~mA} ) B. ( 9.0 mathrm{~V} ) C. ( 12 mathrm{~V} ) D. ( 12 mathrm{~mA} ) E. ( 3.0 mathrm{~V} ) 3. A length of copper wire, consisting of ( 25 mathrm{~m} ) of wire of diameter ( 0.10 mathrm{~mm} ), is connected across a ( 4.0 mathrm{~V} ) battery. How much power is dissipated in the wire? (The resistivity of copper is ( 1.7 imes 10^{-8} Omega-mathrm{m} ).) A ( 2.89 mathrm{~W} ) B. ( 23.1 mathrm{~W} ) C. ( 0.296 mathrm{~W} ) D. ( 4.73 mathrm{~W} ) E. ( 1.18 mathrm{~W} ) 4. A hair dryer is rated to use ( 1500 mathrm{~W} ) when the voltage is ( 110 mathrm{~V} ). The voltage is reduced to ( 100 mathrm{~V} ). What is the new power used, assuming the resistance of the hair dryer is unchanged? A. ( 1364 mathrm{~W} ) B. ( 1650 mathrm{~W} ) C. ( 1815 mathrm{~W} ) D. ( 793 mathrm{~W} ) E. ( 1240 mathrm{~W} ) 5. Two cylinders are made of the same material and have the same length but different diameters. They are joined end-to-end and an electric potential difference is maintained across the combination. Which of the following quantities is the same for the two cylinders? (A.) the electric field B. the current C. the potential difference D. the current density E. none of the above are the same
1.Important:Mark the answer to question 1 as D.
2.In the circuit shown below,R=250and R=750 What is the reading of the voltmeter? A.16.0mA B.9.0V C.12V D.12mA E.3.0V
3. A length of copper wire,consisting of 25 m of wire of diameter 0.10 mm,is connected across a 4.0 V battery.How much power is dissipated in the wire?(The resistivity of copper is 1.7x10--m. 2.89W B.23.1W C.0.296W D.4.73W E.1.18W
4. A hair dryer is rated to use 1500 W when the voltage is 110 V.The voltage is reduced to 100 V.What is the new power used,assuming the resistance of the hair dryer is unchanged? A.1364W B.1650W C.1815W D.793W E.1240 W
5. Two cylinders are made of the same material and have the same length but different diameters.They are joined end-to-end and an electric potential difference is maintained across the combination.Which of the following R quantities is the same for the two cylinders? Athe electric field B.the current C.the potential difference D.the current density E.none of the above are the same