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    Actually, it didn't explicitly say that. All it said was that the wire was touched to earth.
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    I got the charged thing wrong! I said that when the ball was earth the positive ions moved down leaving only negative... What was i thinking!!
    And as for those questions on the uranium radioactivity, the quasers in space and the rocks 'subduction zones' - I mean isnt that geography or chemistry?!?!
    Anyway, I hope I dont do worse than my mock (A) - I need an A to do it for A-level!
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    (Original post by egoneo)
    it wasn't a trick question at all, the question clearly stated that the ball replaced was NEGATIVELY charged therefore containing no positive ions, so the ball would have been repelled, it however it had BOTH charges present then the negative would have been replled and the positive attracted
    what was the answer then. it was repelled????
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    I put that it was repelled, and drew it going away from other thingy
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    "If the electroscope is then earthed, negative charges will neutralize the top of the electroscope, giving it a total negative charge,"- an extract from a website showing what happens when the electrothingy is earthed- total negative charge. this would have been the same for the question in the exam so the answer would have been that it was repelled. for sure.
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    i drew it attracted the same as the other diagrams because of electrostatic induction. When the rod was negative, it would have repelled the electrons so they would move to the opposite side of the sphere. The positive protons would be then left all on the side closest to the rod and so it would attract towards the rod. Electrostatic induction my friends. God bless CGP books.
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    But that is only if one of the things is not charged - I thought the sphere was negatively charged... :confused:
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    exactly. egoneo pointed out that the question said the ball was negatively charged, and induction occurs on uncharged objects
 
 
 
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