Question
Physics Question on Magnetism and matter
Figure shows a straight wire length l carrying current i. The magnitude of magnetic field produced by the current at point P is.
A
π12μ0i
B
4π1μ0i
C
8π12μ0i
D
22π1μ0i
Answer
8π12μ0i
Explanation
Solution
The given situation can be redrawn as follows. As we know the general formula for finding the magnetic field due to a finite length wire
B=4πμ0⋅ri(sinϕ1+sinϕ2)
Here, ϕ1=0∘,ϕ=45∘
∴B=4πμ0⋅ri(sin0∘+sin45∘)
=4πμ0⋅2Li
⇒B=8πl2μ0i