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Solution


Q.

Which of the following correctly describes the magnetic field near a long straight wire
1 The field consists of straight lines perpendicular to the wire  
2 The field consists of straight lines parallel to the wire.  
3 The field consists of radial lines originating from the wire.  
4 The field consists of concentric circles centred on the wire.  

Ans.

(4)

The magnetic field near a long straight wire consists of concentric circles whose centres lie on the wire. This can be confirmed by the Right-hand Thumb Rule.

According to this rule, if we put the thumb of our right hand in the direction of the current flow through the conductor/straight wire and encircle the wire with our fingers, then the direction of those fingers will correspond to the direction of the magnetic field.

Thus, the magnetic field lines will be in concentric circles around the conductor.