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[" 86.Two circular coils "1" and "2" are...

[" 86.Two circular coils "1" and "2" are made from the "],[" same wire but the radius of the "1" " coil is twice "],[" that of the "2^(" nd ")" coil.What potential difference "],[" in volts should be applied across them so that "],[" the magnetic field at their centres is the same? "],[[" (a) "2," (b) "3],[" (c) "4," (d) "6]]

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