Two thin long straight wires are parallel to each other at a separation r apart and they carry current I each along the same directions as shown then induction of magnetic field B. between the wires, varies with according to
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a
b
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d
answer is B.
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Detailed Solution
B=μ0I2πx-μ0I2π(r-x). At x=r2, B=0 As x→0 ,B→∞ Also as x→r ,B→-∞