Question

10^6 positrons are flowing normally through an area in
forward direction and same amount of electrons are flowing
in backward direction in the interval of 10 ms. Find the
current through the area.​

Answer 1

Thus the current through the area is 3.2 x 10^-11 A

Explanation:

As electrons flow in opposite to that positrons then conventional positive charges flow in the same direction as that of positrons.

Hence total number of charges is 2 x 10^6.

Each charge = 1.6 x 10^-19 C

Total charge = 2 x 10^6 x 1.6 x 10^-19 C

Time taken = 10 m s = 10 x 10^-3 s

Current = charge / time = 3.2 x 10^-13 / 10 x 10^-3 = 3.2 x 10^-11 A

Thus the current through the area is 3.2 x 10^-11 A