Here ,
primary voltage V1 = 220 V
primary winding n1 = 100 turns
secondary winding n2 = 1000 turns
secondary voltage v2 = ?
We know that,
\(\frac{v_2}{v_1}=\;\frac{n_2}{n_1}\)
\(V_2=\;\frac{n_2}{n_1}\times V1\)
V2 = 220 * 10
V2 = 2200 V
therefore, secondary voltage V2 = 2200 V