The total momentum of electrons in a straight wire of copper of length 1m carrying a current of 16A is

a. 91 x 10⁻¹⁵Kgm/s
b. 91 x 10⁻¹⁶Kgm/s
c. 91 x 10⁻¹⁴Kgm/s
d. 91 x 10⁻¹²Kgm/s