Objects A and B are both positively charged. Both have a massof 150g , but A has

Question

Objects A and B are both positively charged. Both have a massof 150g, but A has twicethe charge of B. When A and B are placed with 15cm between their centers, Bexperiences an electric force of 0.35 N.   1)     How large is the force on objectA? 2)    What is the charge onQA? 3)    What is the charge onQB? Objects A and B are both positively charged. Both have a massof 150g, but A has twicethe charge of B. When A and B are placed with 15cm between their centers, Bexperiences an electric force of 0.35 N.   1)     How large is the force on objectA? 2)    What is the charge onQA? 3)    What is the charge onQB?

Explanation / Answer

Given    QA = 2q               QB = q               r= 15cm              F = 0.35N 1)force acted on object A is same as that of objectB     F = kQAQB/r2          =(9*109N.m2/C2* 2*q2)/(15*10-2)2         0.35N =0.24q2*105           q2 = (0.35/0.24)*10-5                = 0.14*10-6            q =0.374mC charge on QA = 2*0.374mC                       = 0.748mC charge on QB = 0.374 mC          

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