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The electric field strength at a distance point, $\mathrm{P}$, due to a point charge, $+q$. located on the origin, is $100 \mu \mathrm{V} / \mathrm{m}$. If the point charge is now enclosed by a perfectly conducting metal sheet sphere whose centre is at the origin, then the electric field strength at the point. $P$. outside the sphere, becomes.

1. zero
2. $100 \mu \mathrm{V} / \mathrm{m}$
3. $-100 \mu \mathrm{V} / \mathrm{m}$
4. $50 \mu \mathrm{V} / \mathrm{m}$