An electrically isolated hollow (initially uncharged) conducting sphere has a small positively c...

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An electrically isolated hollow (initially uncharged) conducting sphere has a small positively charged ball suspended by an insulating rod from its inside surface (see figure).
This causes the inner surface of the sphere to become negatively charged. When the ball is centered in the sphere the electric field outside the conducting sphere is
(1) zero
(2) the same as if the sphere was not there
(3) twice what it would be if the sphere was not there
(4) equal in magnitude but opposite in direction to what it would be if the sphere was not there
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