An ac generator consisting of a coil with N turns rotating at angular speed ? in an external magnetic field B produces a maximum emf ?0
If you now decrease the number of turns in the coil to N/2 and at the same time cause it to rotate twice as fast, what will be the new maximum emf if you do not change any of the other quantities?
A) 2?0 B) ?0 C) 4?0 D) ?0/4 E) ?0/2
B
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Wood boards ¼ inch thick have a moisture content of 60% by mass. If the diffusivity of water in wood is taken as 3 x 10^-10ft^2/s, estimate the time for the wood to have a moisture content of 5% at its center if the air surrounding the boards was originally dry and hD (the convective mass transfer coefficient) is 1 x 10^-8ft/s.
What will be an ideal response?
Parallel-Plate Capacitor: An ideal air-filled parallel-plate capacitor with horizontal plates has a plate separation of 5.0 cm. If the potential difference between the plates is 2000 V, with the top plate at the higher potential, what are the magnitude and direction of the electric field between the plates?
A. 100 N/C upward B. 100 N/C downward C. 40,000 N/C upward D. 40,000 N/C downward
Answer the following statement(s) true (T) or false (F)
1. We can define the local wavelength of any continuous and doubly differentiable function.
A uniform linear charge density of 4.0 nC/m is distributed along the entire x axis. Consider a spherical (radius = 5.0 cm) surface centered on the origin. Determine the electric flux through this surface
a. 68 N × m2/C b. 62 N × m2/C c. 45 N × m2/C d. 79 N × m2/C e. 23 N × m2/C