A) \[\frac{1}{9\times {{10}^{9}}}N\]
B) \[9\times {{10}^{9}}N\]
C) \[9\times {{10}^{7}}N\]
D) \[\frac{1}{9\times {{10}^{12}}}N\]
Correct Answer: B
Solution :
(b) \[9\times {{10}^{9}}N\]
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