1but shouldnt it be simply +3q?
3 charges 3q,q and Q are placed on straight line with equal separation. in order to make net force on q to be zero.. the value of Q will be????
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5 Answers
1the 1st 2 charges repel.so the 3rd should also repel the 1st to an equal extent?
thus Q=3q,isnt it?
1@madhu if u take Q=-3q then:
3q will repel q and Q will attract q ...hence an equlibrium can never be attained infact there wouldnt be equilibrium for any negative value of Q considering q lies between 3q and Q
1infact there will be one more answer:
there are 3 arrangements possible
1> 3q......Q.......q //there will be no equilibrium in this case considering equal separation
2>3q.......q......Q // the answer for this will be Q=+3q(as akara has mentioned)
3>q......3q......Q // there will be equilibrium in this case as well with Q=+q
i have considered the cases as there is no information provided regarding the arrangement