Perhaps it has occured to you that we could tap Earth\'s magnetic field to gener
ID: 3900208 • Letter: P
Question
Perhaps it has occured to you that we could tap Earth's magnetic field to generate energy. One way to do this would be to spin a metal loop about an axis perpendicular to Earth's magnetic field. Suppose that the metal loop is a square that is 45 cm on each side and that we want to generate an electric potential in the loop of amplitude 120 V ata a place where earths magnetic field is 0.5x10^-4. At what angulare speed (in rev/s) would we ahve to spin the coil? Does this appear to be a feasible method to extract energy from earths magnetic field?
Explanation / Answer
Area
A=L^2= 0.45^2 =0.2025 m^2
Maximum induced emf
Emax=NBAW
W=Emax/NBA
W=120/1*(0.5*10^-4)*0.2025
W=11,851,851.85 rad/s
in rev/s
W=11851851.85/2pi
W=1,886.280.8 rev/s
b)
no