1. The problem statement, all variables and given/known data A 800-turn solenoid, 18 cm long, has a diameter of 2.9 cm. A 15-turn coil is wound tightly around the center of the solenoid. If the current in the solenoid increases uniformly from 0 to 3.1 A in 0.28 s, what will be the induced emf in the short coil during this time? 2. Relevant equations Emf=delta_flux/delta_t 3. The attempt at a solution I keep getting the wrong answer. Originally I just plugged in 800 and 15 for the n's, but then I used turns per meter. Both were wrong. I think I may be using the wrong equation. Any help would be appreciated!
Hi number14, What did you do to get your answers? (what equations did you use, and what numbers did you plug into them)
I used B=(mu_0 *N*I)/l delta_flux = B*pi*r^2 and Emf=-N * delta_flux/delta_t N=15, I=3.1, l=.18, delta_t=.28 , r=.0145 and I got: 3.6 * 10^-5
I'm not getting that answer from using those numbers. What are you getting for just the B part by itself?