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The magnetic induction at a point P which is at a distance of 4cm from a long current-carrying

wire is 10^3T. The field of induction at a distance of 12cm from the current carrying wire will be:
(A) 3.33x10^4T (B) 1.11x10^4T
(C) 3x10^3T (D) 9x10^3T

(all ^ are negative)


We know B=10^-7*2I/r where B =magnetic field of a long current carrying conductor
I=amount of current
r=distance from current element
=>I=20 A
again B=10^-7*2*20/12*10^-3=
0 0 0
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