15. Se o raio de uma espira circular dobrar mantendo a corrente constante, como será afetado campo magnético no centro da espira?

Julia lifts a raw egg and drops it from a height of 6.2 ft . After 0.25 s , the egg is falling at a speed of \( 2.45 \mathrm{~m} / \mathrm{s} \). After 0.50 s, the egg is falling at \( 4.90 \mathrm{~m} / \mathrm{s} \). a. Drop two objects side by side at the same time. Be careful. Make sure neither one will get affected by the air much, but make them significantly different weights. Maybe a small rock and your friend's phone. Make sure the bottoms start at the same height above the ground so they fall the same distance. Make sure you release them at the same time. (If you just THINK about this, you will be making the age-old mistake of trusting your guess/intuition without experimental validation.) Within experimental consistency, do they hit at significantly different times? (Repeat as needed to be sure.) b. Sketch and label the process described for the egg. (Three states!) c. What information is "implied"? What is "red herring" info.? d. Did the egg pick up more speed in the second 0.25 s than the first? Why? Would the egg travel farther the first 0.25 s or the second? Why?

8. La ley de inducción electromagnética de Faraday establece que la fuerza electromotriz (fem) inducida en un conductor es proporcional a qué cantidad. A. Cambio de la densidad de flujo magnético. B. Tasa de cambio de la densidad de flujo magnético. C. Cambio de enlace de flujo magnético. D. Tasa de cambio del enlace del flujo magnético.

If you are orbiting on a rock in Saturn's rings that is 119241 km from the center of the planet, how fast are you going around Saturn in \( \mathrm{km} / \mathrm{sec} \) ? (Saturn has a mass of \( 5.68 \times 10^{26} \mathrm{~kg} \) )

3. La intensidad del campo eléctrico se define como "la fuerza eléctrica por unidad de carga experimentada por una pequeña carga puntual positiva \( q \) ". ¿Por qué la carga de prueba se describe como "pequeña"? A. Porque los electrones son pequeños. B. Obedecer la ley de Coulomb para cargas puntuales. C. Para que el campo eléctrico no se distorsione. D. Para que la carga de prueba no ejerza fuerza sobre otras cargas de la región.

A conductor's opposition to the flow of current depends on the conductor material its cross sectional area, its length and its operating temperature.