A) \[9.8\times {{10}^{6}}N/C\]
B) \[4.9\times {{10}^{6}}N/C\]
C) \[6.8\times {{10}^{6}}N/C\]
D) none of these
Correct Answer: A
Solution :
For equilibrium of drop the force of gravity (mg) must be balanced by upward electric force So, \[qE=mg\] \[E=\frac{mg}{q}\] \[=\frac{2.4\times {{10}^{-12}}\times 9.8}{2.4\times {{10}^{-18}}}\] \[=9.8\times {{10}^{6}}N/C\]You need to login to perform this action.
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