Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q76 (NDA-II/2021) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism

Imagine a current-carrying straight conductor with magnetic field of lines in anti-clockwise direction. Then the direction of current is determined by

Result
Your answer: —  Â·  Correct: C
Explanation

The direction of the magnetic field around a straight current-carrying conductor is determined by the Right-Hand Thumb Rule, also known as the right-hand grip rule [1][3][4]. According to this rule, if you imagine holding the conductor in your right hand with the thumb pointing in the direction of the current, your fingers will curl in the direction of the magnetic field lines [2]. When the magnetic field lines are observed to be in an anti-clockwise direction, applying this rule indicates that the thumb must be pointing in the upward direction [2]. Fleming's Left-Hand Rule is not used for this purpose; it is instead used to determine the direction of force acting on a conductor placed within an external magnetic field [2][3]. Therefore, for an anti-clockwise field, the current must be flowing upwards as per the Right-Hand Thumb Rule.

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 12: Magnetic Effects of Electric Current > 12.2.2 Right-Hand Thumb Rule > p. 199
  2. [3] Science , class X (NCERT 2025 ed.) > Chapter 12: Magnetic Effects of Electric Current > What you have learnt > p. 206
  3. [4] https://en.wikipedia.org/wiki/Right-hand_rule
  4. [2] Science , class X (NCERT 2025 ed.) > Chapter 12: Magnetic Effects of Electric Current > Activity 12.7 > p. 203
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.
31%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

CDS-I · 2025 · Q22 Relevance score: 33.75(s)

The rule that determines the direction of a magnetic field produced around a straight conductor carrying current is :

NDA-II · 2025 · Q52 Relevance score: 32.51(s)

The rule to determine the direction of a force experienced by a straight current carrying conductor placed in a magnetic field which is perpendicular to it is

NDA-I · 2013 · Q44 Relevance score: 28.14(s)

A current-carrying wire is known to produce magnetic lines of force around the conducting straight wire. The direction of the lines of force may be described by

NDA-I · 2013 · Q6 Relevance score: 18.31(s)

Imagine a current-carrying wire with the direction of current downward or into the page. The direction of magnetic field lines is