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Calculate magnetic induction at a distan...

Calculate magnetic induction at a distance of 20 cm from a pole of strength 40 Am in air.

A

`10^(-4) wb//m^(2)`

B

`10^(-8) wb//m^(2)`

C

`10^(-1) wb//m^(2)`

D

`10^(-12) wb//m^(2)`

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