1 (a) Using Townsend's second ionization criterion, consider Io = 4 x 10-7 A. Consider a = 2.28/cm. If y = 0.0075, find the gap spacing dspark in cm for spark breakdown criterion. Calculate the current I in A for (i) d = 0.45 xdspark , (ii) d 0.6 x dspark and (iii) d = 0.8 x dspark Show that the current I = I, exp (ad) when d is very small value and y is also very small value. l,ead 1- y(e«d – 1) |
1 (a) Using Townsend's second ionization criterion, consider Io = 4 x 10-7 A. Consider a = 2.28/cm. If y = 0.0075, find the gap spacing dspark in cm for spark breakdown criterion. Calculate the current I in A for (i) d = 0.45 xdspark , (ii) d 0.6 x dspark and (iii) d = 0.8 x dspark Show that the current I = I, exp (ad) when d is very small value and y is also very small value. l,ead 1- y(e«d – 1) |
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Transcribed Image Text:1 (a) Using Townsend's second ionization criterion, consider I,
4 x 10-7 A. Consider a =
2.28/cm. If y = 0.0075, find the gap spacing dspark in cm for spark breakdown criterion. Calculate
the current I in A for (i) d = 0.45 xdspark , (ii) d = 0.6 x dspark and (iii) d = 0.8 x dspark Show that
the current I = Io exp (ad) when d is very small value and y is also very small value.
1,ead
1- y(ead – 1)
(b) For a point-plane gaseous dielectric system, suppose values of a = 2.24 / cm and y =
0.0064.
d
Find the values of
for d = 1.25 cm and d = 1.95 cm.
dd
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