A) \[\frac{3}{5}\]
B) \[6\frac{2}{3}%\]
C) \[U=k\left[ \frac{2q(8d)}{r}-\frac{(2q)(q)}{x}-\frac{(8q)(q)}{r-x} \right]\]
D) None of these
Correct Answer: C
Solution :
We have, \[\frac{\pi }{3}\] \[\frac{\pi }{2}\] \[f(x)={{\log }_{5}}(25-{{x}^{2}})\] \[2x-y+z+3=0,\] \[r=(\hat{i}+\hat{j})+\lambda (\hat{i}+2\hat{j}-\hat{k})\] \[r=(\hat{i}+\hat{j})+\mu (-\hat{i}+\hat{j}-2\hat{k}),\]\[r.(2\hat{i}+\hat{j}-3\hat{k})=-4\] \[r\times (-\hat{i}+\hat{j}+\hat{k})=0\]\[r.(-\hat{i}+\hat{j}+\hat{k})=0\]
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