Question

if current =5 micro ampere and resistance=600 Johnston's potential difference

Answer 1

v=IR

$v = 5 \times {10}^{-6} \times 600$
$v = 3 \times {10}^{-3}$

Answer 2

micro ampere mean 5×10^-6
v=ir
5×10^-6×600
30000×10^-6
3×10^-11