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in Physics by (25.3k points)
एक वृत्ताकार लूप का पृष्ठ क्षेत्रफल A तथा इसमें प्रवाहित धारा i है। चुम्बकीय क्षेत्र की तीव्रता B, लूप के तल के लम्बवत है। चुम्बकीय क्षेत्र के कारण लूप में लगने वाला बल-आघूर्ण है :
A. BiA
B. 2BiA
C. `(1)/(2)`BiA
D. शून्य

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