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Q.

In a hydrogen discharge tube 2.1×1018  protons pass through any cross section per second and  4.15×1018 electrons per second flow through the same cross section in the opposite direction. The current flowing through discharge tube will be

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a

1.0 A

b

 0.4 A

c

 0.8 A

d

 0.2 A

answer is B.

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Detailed Solution

I=2.1×1018×e+4.15×1018×e

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