Current flows through a straight, thin-walled tube of radius r. The magnetic field at a distance x from the axis of the tube has magnitude B. (a) B ∝ x, for 0 < x < r (b) B ∝ 1/x, for 0 < x < r (c) B = 0, for 0 ≤ x < r (d) B = 0, only for x = 0

Current flows through a straight, thin-walled tube of radius r. The ma

1.	Current flows through a straight, thin-walled tube of radius r. The magnetic field at a distance x from the axis of the tube has magnitude B. (a) B ∝ x, for 0 < x < r (b) B ∝ 1/x, for 0 < x < r (c) B = 0, for 0 ≤ x < r (d) B = 0, only for x = 0
Answer» Correct Answer is: (c) B = 0, for 0 ≤ x < r

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Current flows through a straight, thin-walled tube of radius r. The magnetic field at a distance x from the axis of the tube has magnitude B. (a) B ∝ x, for 0 &lt; x &lt; r (b) B ∝ 1/x, for 0 &lt; x &lt; r (c) B = 0, for 0 ≤ x &lt; r (d) B = 0, only for x = 0

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Current flows through a straight, thin-walled tube of radius r. The magnetic field at a distance x from the axis of the tube has magnitude B. (a) B ∝ x, for 0 < x < r (b) B ∝ 1/x, for 0 < x < r (c) B = 0, for 0 ≤ x < r (d) B = 0, only for x = 0