A straight magnetic strip has a magnetic moment of 44 A m². If the strip is bent in a semicircular shape, its magnetic moment will b e ______ A m². (Given π = 22/7)

Question

G1 Physics · Accepted Answer

Let magnetic pole strength be m and original strip length be ℓ. For the straight strip: M₁ = mℓ = 44 When bent into a semicircle: ℓ = πR The separation of poles becomes the diameter: 2R = 2ℓ/π New magnetic moment: M₂ = m(2R) = m(2ℓ/π) = (2/π)(mℓ) = 88/π Using: π = 22/7 M₂ = 28 A m²