कोयले से जुड़ा चुंबकीय प्रवाह दिए गए समीकरण द्वारा दिया गया है: ΦB = 4t² + 3t + 1.
t = 2 सेकंड पर चुंबकीय क्षेत्र की जांच करने के लिए, हम समीकरण को t = 2 सेकंड पर मूल्यांकन करते हैं:
dB/dt = d/dt(4t² + 3t + 1) = 8t + 3
t = 2 सेकंड पर, dB/dt = 8(2) + 3 = 14.
इस प्रकार, t = 2 सेकंड पर चुंबकीय क्षेत्र 14 T है।
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