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The magnetic induction at a point P whic...

The magnetic induction at a point P which is at a distance of 4 cm from a long current carrying wire is `10^(-8)` T. The induction at a distance 12 cm from same current carrying wire is

A

`3.33 xx10^-9` tesla

B

`1.11xx10^-4` tesla

C

`3xx10^-3`tesla

D

`9xx10^-2` tesla

Text Solution

Verified by Experts

The correct Answer is:
A
`B=(mu_0I)/(2pia)because Bprop(1)/(a) (B_2)/(B_1)=(a_1)/(a_2)`
`B_2=(4xx10^-2xx10^-8)/(12xx10^-2)=3.3xx10^-9T`
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