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-10^(-8)कुलॉम और 10^(-8)कुलॉम के दो आवेश एक - दूसरे से 10cm की दुरी पर रखे जाते हैं।
दोनों आवेशों को मिलाने वाली रेखा के अनुदिश `+10^(-8)` कुलॉम आवेश से 0.05 मीटर की दुरी पर ऋणावेश से विपरीत विद्युत - क्षेत्र की तीव्रता व दिशा ज्ञात कीजिए ।

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(c) `E=(1)/(4pi epsilon_(0))(2p)/((r^(2)-l^(2))^(2))`
`=(9xx10^(9)xx2xx10^(-8)xx0.1)/([(0.1)^(2)-(0.05)^(2)]^(2))`
`=(18)/([0.01-0.0025]^(2))=(18)/((0.0075)^(2))`
`=3.2xx10^(5)NC^(-1)`

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