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Question

Current i is flowing in a conducting wire as shown in the figure. The radius of circular part is R and the length of straight portion is very large. The value of magnetic field at the centre O is

एक चालक तार में धारा i चित्रानुसार प्रवाहित हो रही है। वृत्तीय भाग की त्रिज्या R है तथा सीधे भाग की लम्बाई अत्यधिक है। केन्द्र O पर चुम्बकीय क्षेत्र का मान है

A
μ0i2R
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B
μ0i4πR(2+π)
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C
3μ0i8R
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D
μ0i2πR(2+π2)
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