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R Problem 1 8 A thin insulated wire form a spiral of N 100 turns...

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R Problem 1 8 A thin insulated wire form a spiral of N 100 turns carrying a current of i 8mA The inner and outer radii are equal to a 5cm and b 10cm Find the magnetic field at the centre of the coil Solution Let n no of turns per unit length along the radial of spiral Consider a ring of radii x and x dx N ndy n

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