A) \[4.3\times {{10}^{-7}}\operatorname{m}\]
B) \[7.8\times {{10}^{-7}}\operatorname{m}\]
C) \[0.078\times {{10}^{-7}}\operatorname{m}\]
D) \[3.4\times {{10}^{-7}}\operatorname{m}\]
Correct Answer: B
Solution :
| [b] \[F=qE=mg(q=6e=6\times 1.6\times {{10}^{-19}})\] |
| Density [d] \[=\frac{\text{mass}}{\text{volume}}=\frac{m}{\frac{4}{3}\pi {{r}^{3}}}\]or\[{{r}^{3}}=\frac{m}{\frac{4}{3}\pi d}\] |
| Putting the value of d and\[m\left( =\frac{qE}{g} \right)\]and solving we get \[r=7.8\times {{10}^{-7}}m\] |
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