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If a long cylindrical conductor carries a steady current parallel to its length, then

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the magnetic field along the axis is zero

the magnetic field outside the conductor is zero

the electric field along the axis is zero

the electric field outside the conductor is zero

answer is B, D.

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Detailed Solution

If current flows in a conductor, then

$E \neq 0$ (for inside points)

$E = 0$ (for outside points)

$B = \frac{μ_{0}}{2 π} \frac{i}{R^{2}} r$ (for inside points)

$B = 0$ at $r = 0$ , i.e., at centre

$B = \frac{μ_{0}}{2 π} \frac{i}{r}$ for outside points

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