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Question

Which of the following correctly describes the magnetic field near a long straight wire ?
  1. the field consists of concentric circle centered on the wire
  2. the field consists of straight lines perpendicular to the wire
  3. the field consists of straight lines parallel to the wire
  4. none of the above

A
the field consists of straight lines parallel to the wire
B
none of the above
C
the field consists of concentric circle centered on the wire
D
the field consists of straight lines perpendicular to the wire
Solution
Verified by Toppr

The magnetic field around a current carrying long straight wire is in concentric circles whose magnitude is given by,
μ0I=B(2πr)
B(r)=μ0I2πr

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

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