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A Rowland ring of mean radius 15 cm has 3500 tums of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetising current of 1.2 A? |
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Answer» Solution :When toroidal space in a toroid is FILLED with some magnetic material, it becomes Rowland ring. Magnetic field inside this material is given by, `B = munI` `therefore B= mu_(R) mu_(0) ((N)/( 2PI r) ) I` (Where, `N=` total no. of turns, `mu_(r) =`Relative permeability, `r=` Average radius of a toroid) `therefore B= (800)(4pi xx10^(-7) ) ((3500)/( 2pi XX 0.15))(1.2)` `therefore B = 4.48` T |
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