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In the infinite plance, $y=6 \mathrm{~m}$, there exists a uniform surface charge density of $(1600 \pi)$ $\mu \mathrm{C} / \mathrm{m}^{2}$. The associated electric field strength is

1. $30 \mathrm{iV} / \mathrm{m}$
2. $30 \mathrm{jV} / \mathrm{m}$
3. $30 \mathrm{kV} / \mathrm{m}$
4. $60 \mathrm{iV} / \mathrm{m}$