Which of the following correctly describes the magnetic field near a long straight wire?

(a) The field consists of straight lines perpendicular to the wire.

(b) The field consists of straight lines parallel to the wire.

(c) The field consists of radial lines originating from the wire.

(d) The field consists of concentric circles centred on the wire.

 

Answer

The field consists of concentric circles centred on the wire.

 

Explanation - When electric current is carried by a straight wire, it produces magnetic field lines in the form of concentric circles.

Magnetic Field in a Straight Current Carrying Conductor - Teachoo.png

  1. Class 10
  2. Chapter 13 Class 10 - Magnetic Effects of Electric Current

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.