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A coil of one turn is made of a wire of certain length and then from the same length a coil of two turns

A coil of one turn is made of a wire of certain length and then from the same length a coil of two turns is made. If the same current is passed in both the cases, then the ratio of the magnetic inductions at their centres will be (a) 2:1 (c) 4:1 (b) 1:4 (d) 1:2

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