Answer:
12 × 10^12 Nm^2/C
Step-by-step explanation:
According to the Gauss's theorem
The total electric flux by the enclosed charge is given by
Charge enclosed / €0
So flux by each surface
= Q enclosed / 6 × €0
= 641 / ( 6 × 8.854 × 10^-12)
= 12 × 10^12 Nm^2/C