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Question:

A current loop, having two circular arcs joined by two radial lines is shown in the figure. It carries a current of 10A. The magnetic field at the point O will be close to :

1.0×10𕒻T

2.0×10𕒻T

1.0×10𕒹T

1.5×10𕒹T

Solution:

→B=μ₀i4πθ[1r₁−1r₂]^kr₁=3cm=3×10⁻²mr₂=5cm=5×10⁻²mθ=π4,i=10A→→B=4π×10⁻⁷×10[13×10⁻²−15×10⁻²]^k→|→B|=π3×10⁻⁹T≈1×10⁻⁹T