Given, the current flowing in a copper voltmeter, I=1.6A As we know that, Charge, Q= Total number of ions × Charge on electron (e) Q=n×e .......(i) Charge Q=
Current
Time
Q=
I
t
From Eq. (i), we get n×e=
I
t
(∵t=1min given ) n×1.6×10−19=1.6(∵e=1.6×10−19C) Now, the number of Cu++ ions deposited at the cathode per minute is n=