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A positively charged iron rod is brought close without touching a neutral sphere of aluminium. The aluminium sphere is grounded with wire, when the wire is removed the aluminium sphere will become:

A positively charged iron rod is brought close without touching a neutral sphere of aluminium. The aluminium sphere is grounded with wire, when the wire is removed the aluminium sphere will become: Correct Answer Negative

CONCEPT:

Charging by induction:

  • If a charged body is brought near an uncharged body, then one side of the neutral body (closer to charged body) becomes oppositely charged while the other side becomes similarly charged.
  • In charging by induction the charged body does not touch the uncharged body.
  • In charging by induction the charge generated on the uncharged body will be of the opposite nature as the charge on the charged body.

  • When we bring a positively charged iron rod near a sphere of aluminium, the electrons in the sphere will move towards the rod and accumulated on the rod side due to attraction.
  • After that, if the sphere is grounded with a wire then the electrons from the earth will start moving towards the sphere.
  • After that, if the wire is removed then the sphere will become negatively charged. Hence, option 2 is correct.

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