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माना `E_(1)(r), E_(2)(r)` व `E_(3)(r)` किसी रेखीय आवेश घनत्व के अनंत लम्बाई के तार पर r दुरी पर q आवेश के लिए क्रमशः विद्युत क्षेत्र का मान है। यदि एकसमान आवेश घनत्व `sigma` विद्युत - क्षेत्र `E_(1)(r_(0))=E_(2)(r_(0))=E_(3)(r_(0))` क्रमशः `r_(0)` दुरी पर हो, तो -
A. `Q=4pi sigma r_(0)^(2)`
B. `r_(0)=(lambda)/(2pi sigma)`
C. `E_(1)((r_(0))/(2))=2E_(2)((r_(0))/(2))`
D. `E_(2)((r_(0))/(2))=4E_(3)((r_(0))/(2))`.

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Best answer
Correct Answer - c
`E_(1)=((r_(0))/(2))=4E_(1)(r_(0))`
`E_(2)((r_(0))/(2))=2E_(2)(r_(2))=2E_(1)(r_(0))`
या `E_(1)(r_(0))/(2)=2E_(2)`

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