JEE Advanced 2020 Full Test 1 Paper 1

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Question : 1 of 54
 
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Figure shows cross-sectional view of a long solid cylinder of radius 'R'. Current ' 'I' flows along outward direction along length of cylinder. Then, find ∫
→
B
â‹…
→
dâ„“
along BA
Given: OB=(√3+1)R,OA=2R,∠OBA=45∘. Where 'O' is point of axis of cylinder.
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