Q.

The magnetic lines of force due to a straight current-carrying conductor are:

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a

Circular lines

b

Straight lines

c

Elliptical lines

d

Concentric lines

answer is A.

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Detailed Solution

The magnetic lines of force due to a straight current-carrying conductor are circular lines

The magnetic field lines due to a straight current-carrying conducting wire are concentric circles with the wire passing through the center. 

Magnetic lines of force are always closed loops.
Also, for the straight current-carrying conductors, their strength depends only on radial distance.

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The magnetic lines of force due to a straight current-carrying conductor are: