Question

3×10¹7 electron cross in 30 seconds through an area.what is the electric current?

Answer 1

Hi.
Given----
number of electrons(n) = 3 × 10 to the power 7
Time taken by the electrons(t) = 30 seconds
Also. we know charge on one electron = -1.6 × 10 to the power19

Using the formula, Charge = no of electrons × charge on one electrons
                                 Q = n × e-
                                 Q = 3 × 10 to the power 7 × 1.6 × 10 to the power 19
                             
Now, using the formula of current (I)
                                           I= Q /t
                         I= ( 3 × 10 to the power 7 × 1.6 × 10 to the power 19) / 30
                         I= 1.6 × 10 to the power 28 A
                         I= 1.6 × 10^28 A

Hope it will help u.