Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q62 (NDA-II/2025) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism Answer Verified

The magnetic field inside a current carrying very long solenoid is

Result
Your answer: —  Â·  Correct: A
Explanation

The magnetic field inside a current-carrying very long (ideal) solenoid is uniform. This means the field has a constant magnitude and direction at all points within the interior region. According to Ampere's Law, for a sufficiently long and densely wound coil, the magnetic field lines inside are parallel to the solenoid's axis and are represented as straight lines [1]. This parallel arrangement indicates that the magnetic field strength is the same at all points inside the solenoid. While the field may diverge or weaken near the ends of a finite solenoid, in the case of a 'very long' or infinite solenoid, the internal field is homogeneous and the external field is considered approximately zero [1]. The magnitude of this uniform field is given by the formula B = μ₀nI, where 'n' is the number of turns per unit length.

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 12: Magnetic Effects of Electric Current > 12.2.3 Magnetic Field due to a Current through a Circular Loop > p. 200
How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
50%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

CDS-II · 2021 · Q2 Relevance score: 4.99

The magnetic field lines inside a current carrying long solenoid are in the form of

NDA-I · 2017 · Q37 Relevance score: 2.62

In a solenoid, the current flowing through the wire is / and number of turns per unit length is n. This gives a magnetic field B inside the solenoid. If number of tuni per unit length is increased to 2/j, what will be the value of magnetic field in the solenoid ?

NDA-II · 2010 · Q54 Relevance score: 0.77

The direction of magnetic field at a point due to an infinitely long wire carrying current is

NDA-I · 2019 · Q47 Relevance score: -0.18

Consider the following statements about a solenoid: 1. The magnetic field strength in a solenoid depends upon the number of turns per unit length in the solenoid 2. The magnetic field strength in a solenoid depends upon the current flowing in the wire of the solenoid 3. The magnetic field strength in a solenoid depends upon the diameter of the solenoid Which of the statements given above are correct?