Question

Q4. The direction of electric current passed through a vertical wire passing through a
Horizontal card is shown below.
Vertical Wire
Horizontal board
(a) Sketch the pattern of magnetic field lines on the card board around the wire.
(b) Indicate the direction of magnetic field at any point.
(c) State the rule that determine the direction of magnetic field lines in it.
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Answer 1

Answer:

see attached figure, it gives us the patterns of magnetic field lines produced around a current carrying straight conductor passing perpendicularly through horizontal cardboard.

: if the current carrying conductor is held in the right hand in such a way that thumb point in the direction of current, then direction of the curl of the fingers will give the direction of the magnetic field. it is understood by shown below figure.

we know, strength of magnetic field is inversely proportional to separation between two consecutive magnetic lines of forces.

we also know, density of magnetic lines of forces decreases when we move away from the straight conductor. it means, separation between two magnetic lines of forces increases when we move away from the straight conductor.

so, magnetic strength decreases when we move away from the straight conductor.

Answer 2

Explanation:

The pattern of magnetic field lines on the card around the current carrying conductor for the downward direction of current is shown. They are concentric in circle with their centre ties on the axis of wire.

Direction of magnetic field lines can be checked experimentally by placing a magnetic compass needle any where on the card board. Direction of its North pole indicating the direction of magnetic field.

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