Magnetism and Matter Class 12 Physics: Magnetic Field Lines (Ch-5) | BYJU'S NEET 2022 Exam Prep

SOLVED: Magnetic Moment of a Sample. The magnetic moment of a sample with magnetization 𝐌 may be written as μ=∫𝐌(𝐫) d v We may define two quantities related to 𝐌, the magnetic pole density, =-∇·𝐌(𝐫) and the superficial density of magnetic poles, = 𝐌(𝐫) ·𝐧, where 𝐧 is the unit vector normal to the surface of the sample. From the vector expression ∇·(f 𝐀)=(∇f) ·𝐀 f ∇·𝐀 where f is a scalar function and 𝐀 a vector function, show that μ=𝐫 d v 𝐫 d a where S is the limiting surface of t

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