(a) Deduce the relation between current I flowing through a conductor and drift velocity `vecv_d` of the electrons.
(b) Figure shows a plot of current I flowing through the cross section of a wire versus the time t. Use the plot to find the charge flowing in 10 s through the wire.

Explanation

Area under I-t graph gives the charge flowing:
` therefore ` Charge flowing through a cross-section of wire in 10 s,
q=area OABC = area OAD + area DABC= `1/2xx5xx5 + 5xx (10-5) = 12.5 + 25 = 37.5 C`