A) \[-20\times {{10}^{-5}}\mu C\]
B) \[-5\times {{10}^{-5}}\mu C\]
C) \[5\times {{10}^{-5}}\mu C\]
D) \[20\times {{10}^{-5}}\mu C\]
Correct Answer: B
Solution :
QE = mg \[\Rightarrow \,Q=\frac{mg}{E}=\frac{5\times {{10}^{-5}}\times 10}{{{10}^{7}}}\]\[=5\times {{10}^{5}}mC\]. Since electric field is acting downward so for balance charge must be negative.You need to login to perform this action.
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