railway RRB JE (CBT I + CBT II) Mock Test 2024 Engineering Mathematics Calculus Vector Calculus

त्रिज्या 2 इकाई के एक वृत्त के अनुदिश ∮ dI का मान क्या होगा?

1
शून्य
2
2π 
3
4π 
4
8π 
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