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A cylindrical conductor of radius R is carrying a constant current. The plot of the magnitude of the magnetic field.  

  

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A cylindrical conductor of radius R is carrying a constant current. The plot of the magnitude of the magnetic field. B with the distance d from the centre of the conductor, is correctly represented by the figure :

2s.png

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Correct option:(3)

Explanation:

2s.png

Inside (d < R)

Magnetic field inside conductor

2s.png

or B = Kd ...(i)

Straight line passing through origin

At surface (d = R)

2s.png

Maximum at surface

Outside (d > R)

2s.png

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