Question

A thick copper wire is passed through a hole in a
cardboard held in the horizontal plane, such that
the current moves in the copper wire in the upward
direction. Plot four magnetic lines of force around
the conductor by drawing a neat diagram and show
clearly the direction of magnetic lines of force.​

Answer 1

Answer:

Magnetic field lines due to straight wire is pair of circles with center at the position of wire

Explanation:

When current flows through a straight wire then magnetic field lines due to straight current carrying wire is always in the form of concentric loops around the wire

This magnetic field lines are family of circles of increasing radius

The direction of field lines is given by Right hand thumb rule

As per right hand rule we know that if thumb is along the current in the wire than direction of curl of fingers is always the direction of magnetic field due to straight wire

so here the field lines are given as

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Topic : magnetic field lines

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Answer 2

Thanks for free point. I hope you have got your answer.