From Ampere's circuital law for a long straight wire of circular cross-section carrying a steady cur

Q: What is NEET?

NEET is a competitive examination conducted in India. This question is from the 2022 NEET Physics paper.

Q: How can I prepare for NEET Physics?

To prepare for NEET Physics, practice previous year questions (PYQs), understand concepts thoroughly, and solve mock tests regularly. This 2022 question covers Moving Charges and Magnetism topic.

Q: What is the difficulty level of this question?

This NEET 2022 Physics question has a easy difficulty level and is marked as an important question.

Q: Where can I find more NEET previous year questions?

You can find more NEET previous year questions on AspirantMitraa. Browse by subject, topic, year, and difficulty level to practice effectively.

Question

From Ampere's circuital law for a long straight wire of circular cross-section carrying a steady current, the variation of magnetic field in the inside and outside region of the wire is

Accepted Answer

Correct Answer: D - Linearly increasing inside, then decreasing as 1/r outsideStep-by-step Solution:For a long straight cylindrical wire of radius R carrying uniform current I:Inside (r Outside (r > R): B × 2πr = μ₀I. Therefore B = μ₀I/(2πr), so B ∝ 1/r (decreasing).The field is maximum at the surface (r = R) and decreases on both sides.Why other options are incorrect: Option A incorrectly states decreasing inside. Option B says uniform (incorrect for both regions). Option C correctly states linear increase inside but incorrectly says linear decrease outside - the correct dependence outside is 1/r, not linear.Key Concept: Ampere's law: ∮ B·dl = μ₀I_enclosed. Inside wire: B ∝ r; outside wire: B ∝ 1/r.

From Ampere's circuital law for a long straight wire of circular cross-section carrying a steady current, the variation of magnetic field in the inside and outside region of the wire is

Master NEET with Our Test Series

More Questions from Moving Charges and Magnetism

Frequently Asked Questions

From Ampere's circuital law for a long straight wire of circular cross-section carrying a steady current, the variation of magnetic field in the inside and outside region of the wire is

Master NEET with Our Test Series

More Questions from Moving Charges and Magnetism

Frequently Asked Questions