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A long straight wire of circular cross- ...

A long straight wire of circular cross- section carries a current along its length. On the axis inside the wire, it follows that

A

strength of electric and magnetic fields are zero

B

strength of electric field is zero but magnetic field is non`-` zero

C

strength of electric and magnetic field non`-`zero

D

strength of electric field is non`-`zero but magnetic field is zero.

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