Choose accelerating voltage and coil current such that the area encountered by electrons is minimal.
Then check that the ratio $\frac{\sqrt{V_{\text a}}{I}$ is approximately equal to the theoretical value of 6.0.

## controls

Acceleration Voltage Va
0.0 V

$v_0=$ ${0}$ $\frac{\text m}{\text s}$

Coil Current I
0.0 A

$B=$${0}$ $\text {T}$

$\frac{\sqrt{U_{\text b}}}{I}=$ -