Question

What are the properties of magnetic field lines around a straight conductor?
(class 10 CBSE SAMPLE PAPER 2017-18 SCIENCE)

Answer 1

SOLUTION:
The properties of magnetic field lines around a straight conductor are as follows:

1.Around a straight conductor(Straight wire) the magnetic field lines are in the form of concentric circles .

2.The plane of the magnetic field line is perpendicular or normal to the straight conductor.

3.If the direction of the current in the wire is reversed the direction of magnetic field lines also gets reversed.

4.When the direction of current is downwards then a direction of the field lines  is clockwise. 5.when the direction of the current in the wire flows in upward direction then the lines of magnetic field are in the anticlockwise direction.

6.The magnitude of the magnetic field is directly proportional to the current passing in the conductor.

7.The magnitude of the magnetic field is inversely proportional to the distance from the conductor (wire).

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Answer 2

Two concentric circles are formed. The closed and curved loops are forms . They never intersect each other. It is directly proportional to current.