In hydrogen discharge tube, it is observed that through a given cross-section 3.31 × 1 0 15 electrons are moving from right to left and 3.12 × 1 0 5 protons are moving from left to right. The current

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In hydrogen discharge tube, it is observed that through a given cross-section 3.31 × 1 0 15 electrons are moving from right to left and 3.12 × 1 0 5 protons are moving from left to right. The current in the discharge tube and its direction will be

TestHub · Accepted Answer

Here, number of electrons n e ​ = 3.13 × 1 0 15 and number of protons n p ​ = 3.12 × 1 0 15 Current I = n e ​ q e ​ + n p ​ q p ​ = 3.13 × 1 0 15 × 1.6 × 1 0 − 17 + 3.12 × 1 0 15 × 1.6 × 1 0 − 19 = 1 × 1 0 − 3 = 1 mA ​ Now, due to excess charge on electrons, the direction of the current will be towards right.

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