A current of i ampere is flowing through each ofthe bent wires as shown the magnitude and direction of magnetic field at O is
μ0i4(1R+2R′)
μ0i4(1R+3R′)
μ0i8(1R+32R′)
μ0i8(1R+3R′)
A
μ0i4(1R+2R′)
B
μ0i4(1R+3R′)
C
μ0i8(1R+3R′)
D
μ0i8(1R+32R′)
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Solution
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The correct option is Dμ0i8(1R+3R′) B=μ0I2R34+μ0I2R14
B=μ0I8[3R′+1R]
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