Proportionality Overview
For each of the questions decide which approach you need to use: proportionality or a typical calculation approach with equations and units.
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Question 1 of 5
1. Question
A uniform electric field exists between two parallel plates. If the distance between the plates is tripled while the voltage is held constant, how does the electric field strength change?
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Question 2 of 5
2. Question
A wire delivers 240 C of charge through a 4 Ω resistor over a period of 2 minutes. What is the voltage drop across the resistor?
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Question 3 of 5
3. Question
A sound wave in air (v = 343 m/s) has a wavelength of 1.35 m. The wave then enters a medium where its speed increases to 1,440 m/s. What is the wavelength of the wave in the new medium?
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Question 4 of 5
4. Question
A capacitor has a plate area of 0.02 m², a plate separation of 4.0 mm, and is connected to a 50 V battery. The plate separation is then halved while the voltage remains constant. What is the ratio of the new charge stored to the original charge stored?
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Question 5 of 5
5. Question
A convex lens has a focal length of 10 cm. An object is placed 40 cm from the lens. Using the thin lens equation, at what distance from the lens does the image form, and is it real or virtual?
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