Q116 / 180 · NEET 2019 (All India) · Physics

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.

  • A
    Figure
  • B
    Figure
  • Correct answer
    C
    Figure
  • D
    Figure

Solution

Inside (d<R)

Magnetic field inside conductor

B=Kd   ..(i)

This is straight line passing through origin

At surface (d=R)

B=μ02π1d

Maximum at surface

Outside (d>R)

B=μ02π1d

or B∝1d  ∴ Hyperbolic

Figure

Hence the correct option is (B)

Hence, the correct answer is option: 'C'.

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