Question

Class 10, Science 1, Lesson 4
Q. Which of the statement given below correctly describes the magnetic field near a long, straight current carrying conductor ?
Options:
a) The magnetic lines of force are in a plane, perpendicular to the conductor in the form of straight lines.
b) The magnetic lines of force are parallel to the conductor on all the sides of the conductor.
c) The magnetic lines of force are perpendicular to the conductor going radially outward.
d) The magnetic lines of force are in concentric circles with the wire the centre, in a plane perpendicular to the conductor.
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Answer 1

Answer:

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OPTION (D) IS CORRECT.

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Answer 2

Answer:

d) The magnetic field lines are concentric circles with the wire in the centre, in a plane perpendicular to the conductor.

Explanation:

Use the right hand thumb rule :

Thumb points the direction of the current in the wire while the curling fingers show the direction of magnetic field.

The field is in the form of concentric circle because of 1/$r^{2}$ dependence of magnetic field on the distance from the wire (r= distance from the wire)