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A straight wire carrying a current of 13...

A straight wire carrying a current of 13 A is bent into a semi-circular arc of radius 2 cm as shown in figure. The magnetic field is `1.5 xx 10^(-4)T` at the centre of arc, then the magnetic field due to straight segment is

A

`1.5 xx 10^(-4)T`

B

`2.5xx10^(-4)T`

C

zero

D

`3xx 10^(-4)T`

Text Solution

Verified by Experts

The correct Answer is:
C
Since dl and r for each element of the straight segments are parallel. Therefore
`vec(dl)xx vecr=0`
Hence, B is also zero.
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