# The magnetic induction at a point P which is at a distance 4 cm from a long current carrying wire is 10^-8 . then what is the field of induction at a distance 12 cm( same value of current)

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by sjhari

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by sjhari

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**B= (uo/4pi). 2i/R**

**B2/B1 = R1/R2 = 0.04/0.12= 1/3**

**Therefore, B2 = 1/3 x 10^-8 = 3.33 x 10^-9 Tesla**