How many electrons move past a fixed reference point every t = 2.90 ps if the current is i = 3.3 μA ?

Amount of electricity = It
= (3.3 × 10⁻⁶ A) × (2.90 × 10⁻¹² s)
= 9.57 × 10⁻¹⁸ C

No. of moles of electrons
= (9.57 × 10⁻¹⁸ C) / (96500 C/mol)
= 9.92 × 10⁻²³ mol

No. of electrons
= (9.92 × 10⁻²³ mol) × (6.02 × 10²³ /mol)
= 60

It's 59