In Example 22.6 the length of a 60 W, 240 Ω lightbulb filament was calculated to be 60 cm.
a. If the potential difference across the filament is 120 V, what is the strength of the electric field inside the filament?
b. Suppose the length of the bulb’s filament were doubled without changing its diameter or the potential difference across it. What would the electric field strength be in this case?
c. Remembering that the current in the filament is proportional to the electric field, what is the current in the filament following the doubling of its length?
d. What is the resistance of the filament following the doubling of its length?
Want to see the full answer?
Check out a sample textbook solutionChapter 22 Solutions
COLLEGE PHYSICS - LCPO
Additional Science Textbook Solutions
University Physics Volume 2
University Physics Volume 1
Lecture- Tutorials for Introductory Astronomy
Tutorials in Introductory Physics
Life in the Universe (4th Edition)
- A particle accelerator produces a beam with a radius of 1.25 mm with a current of 2.00 mA. Each proton has a kinetic energy of 10.00 MeV. (a) What is the velocity of the protons? (b) What is the number (n) of protons per unit volume? (b) How many electrons pass a cross sectional area each second?arrow_forward(a) A defibrillator passes 12.0 A of current through the torso of a person for 0.0100 s. How much charge moves? (b) How many electrons pass through the wires connected to the patient? (See figure two problems earlier.)arrow_forwardUnreasonable Results (a) What is the final speed of an electron accelerated from rest through a voltage of 25.0 MV by a negatively charged Van de Graaff terminal? (b) What is unreasonable about this result? (C) Which assumptions are responsible?arrow_forward
- (a) What is the average power output of a heart defibrillator that dissipates 400 J of energy in 10.0 ms? (b) Considering the high-power output, why doesn’t the defibrillator produce serious bums?arrow_forward(a) What voltage will accelerate electrons to a speed of 6.00107 m/s? (b) Find the radius of curvature of the path of a proton accelerated through this potential in a 0.500-T field and compare this with tire radius of curvature of an electron accelerated through the same potential.arrow_forward(a) Why are fish reasonably safe in an electrical storm? (b) Why are swimmers nonetheless ordered to get out of the water in the same circumstance?arrow_forward
- A Van de Graaff generator is one of the original particle accelerators and can be used to accelerate charged particles like protons or electrons. You may have seen it used to make human hair stand on end or produce large sparks. One application of the Van de Graaff generator is to create X-rays by bombarding a hard metal target with the beam. Consider a beam of protons at 1.00 keV and a current of 5.00 mA produced by the generator, (a) What is the speed of the protons? (b) How many protons are produced each second?arrow_forwarda. Which direction—clockwise or counterclockwise—does an electron travelthrough the wire shown?Explain.b. Does an electron’s electric potential energy increase, decrease, or stay the same as it moves through the wire?Explain.c. If you answered “decrease” in part b, where does the energy go? If you answered “increase” in part b, where does the energy come from?d. Which way—up or down—does an electron move throughthe battery? Explain.e. Does an electron’s electric potential energy increase, decrease, or stay the same as it moves through the battery?Explain.f. If you answered “decrease” in part e, where does the energy go? If you answered “increase” in part e, where does the energy come from?arrow_forwardThe flash on a compact camera stores energy in a 140 μF capacitor that is charged to 220 V. When the flash is fired, the capacitor is quickly discharged through a lightbulb with 5.5 2 of resistance. ▼ Part A Light from the flash is essentially finished after two time constants have elapsed. For how long does this flash illuminate the scene? Express your answer with the appropriate units. 2T = Submit Part B P = Submit O HA Value 0 Request Answer At what rate is the lightbulb dissipating energy 200 us after the flash is fired? Express your answer with the appropriate units. HÅ Value Units Request Answer ? Units ?arrow_forward
- Normal No Spacing I Heading Heading z 4. A 9.0 μF capacitor and a 20 μF capacitor are connected in parallel to an 11.0 V battery. a. What is the total capacitance of the circuit? b. What is the voltage, V₁, across capacitor, C₁? c. What is the voltage, V₂, across capacitor, C₂? d. How much charge, Q₁, is on capacitor, C₁? ntained in the following circuit. How much charge, Q₂, is on capacitor, C₂? Heading S R Heading 6 + 100arrow_forward4. A capacitor is marked 57.8 µF. a. What is the capacitance in farad? b. Ifit is connected across a 120-V power source, what is the amount of charge stored? c. What potential difference is needed to store 57.8 µC?arrow_forwardPhysics *check the image attached*arrow_forward
- College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College