10. Find the intensity of a magnetic field at a point 2 sm away from an infinitely long conductor which a current of 5 A flows through.
Magnetic field
B=μ0I2πrB=\frac{\mu_0 I}{2\pi r}B=2πrμ0I
Put value
I=5A
r=2cm =0.02m
B=4×3.14××10−7×52π×0.02=5×10−5TB=\frac{4\times3.14\times\times10^{-7}\times5}{2\pi \times0.02}=5\times10^{-5} TB=2π×0.024×3.14××10−7×5=5×10−5T
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