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A long straight wire of radius R carries...

A long straight wire of radius R carries a steady current whichis uniformly distributed through the cross section of the wire the magnitudes of the magnetic field at distance `r_1` and `r_2` from the centre of the wire are` B_1` and `B_2 `respectively then

A

`B_1/B_2=(r_1)/(r_2).if r_1ltRand r_2ltR`

B

`B_1/B_2=(r_1)/(r_2).if r_1gtRand r_2gtR`

C

`B_1/B_2=(r_1)/(r_2).if r_1ltRand r_2ltR`

D

none of these

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The correct Answer is:
A
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