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Find force per unit length at P...

Find force per unit length at P

A

`10^(-4)m`

B

`10^(-4)N//m`

C

`3xx10^(-4)N//m`

D

`0.3N//m`

Text Solution

Verified by Experts

The correct Answer is:
B
Let length of wire element at P is dl.
Magnetic field at B,
`B=(mu_(0)i)/(4pir)+0+(mu_(0)i)/(4pir)`
`B=(mu_(0)xx5)/(4pixx5xx10^(-2))xx2`
`B=(mu_(0))/(4pi)xx200`
`B=2xx10^(-5)T`
`"F = iBdl"`
`(F)/(dl)=iB=5xx2xx10^(-5)=10^(-4)"N/m"`
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