Magnetic field lines, generated by a long straight wire carrying a current, are circles concentric with the wire and lie in planes perpendicular to the wire.

a. True

b. False

Answer:True

Explanation:

It is true that magnetic field lines around a current carrying wire is in the form of concentric circles and lie in the plane perpendicular to the wire.

This Fact can be Proven by placing the iron filling around the wire and they will be arranged like concentric circles and Magnetic field intensity diminishes as we go away from the wire.

true

Explanation:

yes it is true.

To find the direction of magnetic field around a current carrying conductor, we use Maxwell; s right hand grip rule.

If we hold a current carrying straight conductor in our right hand such that the thumb indicates the direction of current in the wire then the curing of fingers give the direction of magnetic field around the conductor.