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in Physics by (25.3k points)
अन्नत लम्बाई के सीधे पतले तार में धारा i बहती है। यदि कसी बिंदु की तार से लंबवत दुरी a है, तब उस बिंदु पर उत्पन्न चुंबकीय क्षेत्र a के साथ निम्न प्रकार परिवर्तित होता है :
A. `B alpha a`
B. `B alpha a^(-1)`
C. `Balpha a^(2)`
D. `B alpha^(-2)`

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