Charge/Mass Ratio of Electron and Induction?
1. The electron moves in a circle of radius r = 0.051 cm. The magnetic field B = 0.64 T. Determine the speed of the electron. How many times is the speed of the electron smaller than the speed of light c = 3.0 * 10^8 m/s?
mass of electron = 9.1 x 10-31 kg
charge of electron = 1.6022*10-19 C
2. The magnetic field due to Earth is approximately equal to 0.5*10^-4 T. What current is required in Helmholtz coils used in the lab to produce magnetic field at least ten times larger than the magnetic field due to earth?
Use equation: B = 10.27*10^-4 x I
I is the current
- RealProLv 71 year agoFavorite Answer
Magnetic force = centripetal force?
Bvq = mv^2 / r
v = rBq / m
r = 5.1×10^-4 m
If I is "the current" and B is "the magnetic field", then the constant needs to include units
B = (10.27×10^-4 T/A) * I
Just some small details that are important.