Q. No 1: 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
Ans:
Ans: According to right hand thumb rule the magnetic field
lines, produced around a straight current-carrying conductor, are concentric
circles.
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