The charge that must be on each plate is 3.53 x 10⁻⁸ C.
The electric field between two parallel plates is given as;
C = εA/d
C = Q/V
V = Ed
C = Q/Ed
Q/Ed = εA/d
Q/E = εA
Q = εEA
where;
Q = (8.85 x 10⁻¹² x 8.85 x 10⁵ x 45 x 10⁻⁴)
Q = 3.53 x 10⁻⁸ C
Thus, the charge that must be on each plate is 3.53 x 10⁻⁸ C.
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