3B Scientific Fine Beam Tube T - Manual (Page 10)

4
Fig. 2 Electrical connections to the pair of Helmholtz coils
B r 2 2 2 2 / mT cm
10 0
0
200
400
600
20 30 40
2 / V U
Fig. 3 Graph of r 2 B 2 against 2U for values as measured (black: r = 5 cm, red: r = 4 cm, green: r = 3 cm)