NEET 2019 · PhysicsAmpere thick wirePrevious Year Question
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:
Answer: (C) C. Answer: (C) Solution: By Ampère's law for a uniform-current solid conductor: Inside (d < R): B = μ₀Id/2πR² ⟹ B ∝ d (linear rise from 0).
- A.A
- B.B
- C.C✓
- D.D
Correct Answer
(C) C
Solution & Explanation
Answer: (C) Solution: By Ampère's law for a uniform-current solid conductor: Inside (d < R): B = μ₀Id/2πR² ⟹ B ∝ d (linear rise from 0). Outside (d > R): B = μ₀I/2πd ⟹ B ∝ 1/d (decay). B is maximum at d = R. The graph that rises linearly up to R then falls as 1/d is option 3. → option C.
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