A) \[15min\]
B) \[20\text{ }min\]
C) \[7.5min\]
D) \[25min\]
Correct Answer: B
Solution :
\[qE=mg\] \[E=\frac{V}{d}\] \[q=ne\] \[q=\frac{mg}{E}\] \[ne\frac{mg}{V}d\] (\[\therefore \]\[q=ne\]) \[n=\frac{mgd}{Ve}\] \[=\frac{18\times {{10}^{-14}}\times 9.8\times 0.9\times {{10}^{-2}}}{2000\times 1.6\times {{10}^{-19}}}\] \[n=4.96=5\]You need to login to perform this action.
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