Two identical small conducting balls \(B _1\) and \(B _2\) are given -7 pC and +4 pC charges respectively. They are brou…
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Two identical small conducting balls \(B _1\) and \(B _2\) are given -7 pC and +4 pC charges respectively. They are brought in contact with a third identical ball \(B _3\) and then separated. If the final charge on each ball is -2 pC , the initial charge on \(B_3\) was
✓ Correct answer: b)
-3 pC
Explanation
Concept Used-Charge Redistribution
\({Q}_{T}\)=\({Q}_{1}\)\(+\)\({Q}_{2}\)\(+\)\({Q}_{3}\)
\({Q}_{T}\)= -7+4+\({Q}_{3}\)\(\ldots \ldots\)(1)
after contact
\({Q}_{F}\)=\(\frac{{Q}_{T}}{3}\)= -2pc
\({Q}_{T}\)= -6pc \(\ldots \ldots\)(2)
-6= -7+4+\({Q}_{3}\)
\({Q}_{3}\)= -3pc
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