Magnetic field lines due to a straight wire carrying current are

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Straight

Circular

Parabolic

Elliptical

answer is B.

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Detailed Solution

Concept: As we all know that one of the methods for representing the magnetic field is using magnetic field lines. They provide details regarding the magnetic force acting on a north monopole at any given location. because there are no monopoles in nature. Electric charges and magnetic monopoles have a close relationship.
As we know, current creates a magnetic field. When a compass was positioned close to a long, straight wire carrying electricity, field lines from circular loops centred on the wire were visible. Additionally, according to the right-hand rule, if the thumb of the right hand points in the direction of the current, the fingers will also curl in that same direction.
Hence, the correct answer is option 2.

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