# How many ions pass a point in 1 minute?? [Physics Difficulties]

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#1
"A gas containing doubly charged ions flows to give an electric current of 0.64 Amps.
How many ions pass a point in 1.0 minute"

Had no idea what to do here
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1 year ago
#2
If each ion has two charges then each ion has the equivalent of twice the charge of an electron.
If n ions pass the point in one minute, then the total charge would be 2ne where n = no of ions and e = charge on an electron.
Since Q=It where Q = charge, I = current, and t = time , then 2ne = It. Rearrange to find n.
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#3
thank you
(Original post by Teenie2)
If each ion has two charges then each ion has the equivalent of twice the charge of an electron.
If n ions pass the point in one minute, then the total charge would be 2ne where n = no of ions and e = charge on an electron.
Since Q=It where Q = charge, I = current, and t = time , then 2ne = It. Rearrange to find n.
0
1 year ago
#4
1 amp per second means that 1.6x10^19 electrons pass a given point each second. That comes from the definition of a Coulomb as 1 amp per second and that one Coulomb is 1.6x10^19 electrons.
0
1 year ago
#5
(Original post by Prince of Hell)
1 amp per second means that 1.6x10^19 electrons pass a given point each second. That comes from the definition of a Coulomb as 1 amp per second and that one Coulomb is 1.6x10^19 electrons.
One amp is one coulomb per second. The charge on one electron is -1.6 x 10-19 C, so one coulomb is equivalent to the total charge of 6.25 x 1018 electrons.
0
1 year ago
#6
yeah
(Original post by Teenie2)
One amp is one coulomb per second. The charge on one electron is -1.6 x 10-19 C, so one coulomb is equivalent to the total charge of 6.25 x 1018 electrons.
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