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Inform about helmholtz bobbin which using in e/m experiment. B complete the table and find the average e/m ratio in experiment

V (Volt)
I (A)
r (cm)
В (Тesla)
e/me (C/kg)
2000
0.3
18.50
2000
0.2
17.08
2500
0.3
19.06
2500
0.2
17.08
3000
0.3
18,50
3000
0.2
14.83
Ortalama e/me =

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