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Grade: 12
        Five balls numbered 1 to 5 are suspended using separate thread pairs ( 1,2 ) ( 2,4 ) ( 4,1 ) show electrostatic attraction while pairs ( 2,3 ) ( 4,5 ) show repulsion therefore ball1 must be
3 years ago

Answers : (2)

sahil
13 Points
							
it must be neutra. 2 and 4 show attraction means have opp. charge 2 too show attraction with 1 means 1 and 4 should have same charge but as they are showing attraction too then 1 should be electrically neutral 
3 years ago
Dilpreet singh
21 Points
							Yes must be neutral because of we image that ball 2 is positively charged then ball 4 is negatively charged because 2 and 4 show attractions. Now ball if ball 2 is positively charged then ball 3 is also positively charged because 2 and 3 show repulsion and similarly ball 5 is negatively charged because ball 4 and 5 show repulsion. And we left with ball 1 and it never be positively charged because ball 2 and 1 show attraction it means ball 1 is negatively charged but it is also not possible because ball 1 and 4 also show attraction.  And in the end we know that ball 1 is nor be positively or neither be negatively charged.  It means ball 1 have no charg so it must be neutral.
						
2 years ago
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