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NEET PHYSICSMedium

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 : B

A
B
C
D

Step-by-Step Solution

Magnetic field inside conductor

B=μ0i2πR2dB = \frac{\mu_0 i}{2\pi R^2} d

or B=Kd…(i)\text{or } B = Kd \quad \dots(i)

Straight line passing through origin

At surface (d=Rd = R)

B=μ0i2πR…(ii)B = \frac{\mu_0 i}{2\pi R} \quad \dots(ii)

Maximum at surface

Outside (d > R)

B=μ0i2πdB = \frac{\mu_0 i}{2\pi d}

or B∝1d (Hyperbolic)\text{or } B \propto \frac{1}{d} \text{ (Hyperbolic)}

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