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From Ampere's law, the feild at the axis is zero. Fromx=0x=0
toR1R1, the field increases linearly as the current enclsed
increase.
Fromx=R1→R2x=R1→R2and fromx=R2→R3x=R2→R3, the field decrease
hyperbolically but with different slopes as the media are different.
Hence, the required graph is (c).
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