[" 13.The magnetic field at the centre o...

[" 13.The magnetic field at the centre of a circular "],[" current carrying conductor of radius ris "B_(6)" .The "],[" magnetic field on its axis at a distance "r" from the "],[" centre is "B_(a)" .The value of "B_(c):B_(a)" will be: "],[[" (a) "1:sqrt(2)," (b) "1:2sqrt(2)],[" (c) "2sqrt(2):1," (d) "sqrt(2):1]]

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