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  • If the key in the arrangement (Figure 13.1) is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are (a) Concentric circles (b) Elliptical in shape (c) Straight lines parallel to each other (

If the key in the arrangement (Figure 13.1) is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are
(a) Concentric circles
(b) Elliptical in shape
(c) Straight lines parallel to each other
(d) Concentric circles near the point O but of elliptical shapes as we go away from it

Answers (1)

Hence, the correct answer is option (c).
Explanation:-

 

In certain setups, such as a long, straight current-carrying wire or an electromagnet, the magnetic field lines can appear as straight, parallel lines at certain distances away from the wire or magnet.

So, if the magnetic field lines are due to a uniform or static field, and we assume that no current is flowing anymore (but the residual or static field is present), the lines would appear parallel.

If the key is open there will be no current in the wire and it will not create any magnetic field.
In that case, the magnetic field present will be because of Earth only.
Therefore magnetic field lines will be straight lines parallel to each other.
 

Posted by

infoexpert27

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