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The figure shows the cross section of tw...

The figure shows the cross section of two long coaxial tubes carrying equal current `I` in opposites directions. If `B_1` and `B_2` are magnetic fields at point 1 and 2 as shown in figure then

A

`B_(1)!=0,B_(2)=0`

B

`B_(1)=0,B_(2)=0`

C

`B_(1)!=0,B_(2)!=0`

D

`B_(1)=0,B_(2)!=0`

Text Solution

Verified by Experts

The correct Answer is:
A
At distance r from centre `B=(mu_(0))/(2pi)((i_("in")))/r` (From ampere's cicuital law)
For path -1 `i_("in")1=0:,B_(1)!=0,` For path -2 `i_("in")=0:.B_(2)=0`
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