For air, the breakdown voltage for electrodes separated by a distance d is given by the Paschen formula Вра VB In(Apd) – C where A = 15 (torr · cm)- B = 365 V(torr · cm)¯ -1 C ~ 1.53 Note that 760 torr = 1 atm = 101.325 kPa. Electrodes are separated by d = 10 cm in air at pressure p = 760 torr. (a) What is the breakdown voltage? (b) What is the breakdown voltage if the pressure is reduced to p= 700 torr?

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For air, the breakdown voltage for electrodes separated by a distance d is given by the Paschen
formula
Bpd
VB
In(Apd) – C
where
A = 15 (torr · cm)-
||
B = 365 V(torr · cm)-
C - 1.53
Note that 760 torr
1 atm = 101.325 kPa. Electrodes are separated by d
10 cm in air at
pressure p
760 torr.
(a) What is the breakdown voltage?
(b) What is the breakdown voltage if the pressure is reduced to p= 700 torr?
Transcribed Image Text:For air, the breakdown voltage for electrodes separated by a distance d is given by the Paschen formula Bpd VB In(Apd) – C where A = 15 (torr · cm)- || B = 365 V(torr · cm)- C - 1.53 Note that 760 torr 1 atm = 101.325 kPa. Electrodes are separated by d 10 cm in air at pressure p 760 torr. (a) What is the breakdown voltage? (b) What is the breakdown voltage if the pressure is reduced to p= 700 torr?
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