**Question**

**How many electrons pass through a conductor in 0.2s, if the current passing through it is 0.5A ?**

**Answer**

n = It / q

where n is the number of electrons, I is the current, t is the time, and q is the charge on a single electron (which is approximately 1.6 x 10^-19 Coulombs).

Given that the current I = 0.5 A and the time t = 0.2 s, we can substitute these values into the formula to get:

n = (0.5 A) × (0.2 s) / (1.6 x 10^{-19} C)

n = 6.25 × 10^{18} electrons

Therefore, approximately 6.25 x 10^18 electrons would pass through the conductor in 0.2 seconds, if the current passing through it is 0.5 A.