Two circular coils 1 and 2 are made from the same wire but the radius of the first coil twice that of the second coil. What ratio of the potential difference (in volt) should be applied across them, so that the magnetic field at their centres is the same? [CBSE PMT 2006] a) 2 b) 3 c) 4 d) 6 Two equal electric currents are flowing perpendicular to each other as shown in the figure

Question

Two circular coils 1 and 2 are made from the same wire but the radius of the first coil twice that of the second coil. What ratio of the potential difference (in volt) should be applied across them, so that the magnetic field at their centres is the same? [CBSE PMT 2006] a) 2 b) 3 c) 4 d) 6 Two equal electric currents are flowing perpendicular to each other as shown in the figure

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