A steady electric current is flowing through a cylindrical conductor , then
i) the electric field at the axis of the conductor due to the current is zero
ii) the magnetic field at the axis of the conductor is zero
iii) the Electric field in the vicinity of the conductor is zero
iv) the magnetic field in the vicinity of the conductor is zero

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Only i, ii & iii are true

Only ii, iii & iv are true

Only i, ii are true

Only ii & iii are true

answer is C.

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Detailed Solution

Any conductor that has a current flowing through it has zero net charge throughout. Consequently, there is no electric field in the area around the conductor. Using the Biot and Savart law, we can see that the magnetic field will be zero at the axis of the cylindrical wire. If the electric field at the wire's axis is zero, current cannot flow through the wire.

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