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5. Two light bulbs are each connected to a power supply, which provides a constant potentialdifference of 120 V. It is observed that light bulb 2 is much brighter when connected to thispower supply than light bulb 1.+ −1 2 + −2 +−1 120 V 120 V 120 V These same two lightbulbs are then connected in the circuit at right. What can we say about thebrightness of the bulbs now?A. Bulb 1 glows brighter than bulb 2.B. Bulb 2 glows brighter than bulb 1.C. Both bulbs glow with the same brightness.D. Neither bulb lights up at all.E. This is impossible to answer without knowing more information.6. A certain wire has resistance R. Another wire, of the same material, has half the length and halfthe diameterof the first wire. The resistance of the second wire is:7. A certain capacitor has a capacitance of 3.0 μF. While it is charged to 3.0 μC and isolated, theplates are pulled apart so its capacitance becomes 1.0 μF. The work done by the pulling agent isabout:Page 3
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PHYS 251 - MT2Sample 28. The equivalent resistance between points 1 and 2 of the circuit shown is:1 Ω1 Ω1 Ω2 Ω4 Ω2 Ω5Ω219. The same potential difference is applied to across two wires. Wire 1 carries twice the current ofwire 2. If the resistance of wire 2 is R, what is the resistance of wire 1?A. 2RB. R/2C. 4RD. R/4E. RPage 4