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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > The field due to a wire of n turns and radius r which carries a current I is measured on the axis of the coil at a small distance h from the center of the coil. This is smaller than the field at the centre by the fraction:

The field due to a wire of n turns and radius r which carries a current I is measured on the axis of the coil at a small distance h from the center of the coil. This is smaller than the field at the centre by the fraction:

Figure shows three cases: in all cases the circular part has radius r and straight one are infinetly long. For the same current the ratio of field B at centre P in the three cases B1 ; B2 : B3 is