Q1. [1] medium thorough-understanding
Which of the following statements correctly links the direction conventions used for magnetic fields and forces on current-carrying conductors?
(A) The right-hand thumb rule gives the direction of force on a conductor, while Fleming's left-hand rule gives the direction of the field around it.
(B) Both the right-hand thumb rule and Fleming's left-hand rule can independently give the direction of the magnetic field around a straight wire.
(C) The right-hand thumb rule gives the direction of the magnetic field around a current-carrying straight conductor, while Fleming's left-hand rule gives the direction of force on a current-carrying conductor placed in an external magnetic field.
(D) Fleming's left-hand rule applies only to circular loops and solenoids, not to straight conductors.
- A The right-hand thumb rule gives the direction of force on a conductor, while Fleming's left-hand rule gives the direction of the field around it.
- B Both the right-hand thumb rule and Fleming's left-hand rule can independently give the direction of the magnetic field around a straight wire.
- C The right-hand thumb rule gives the direction of the magnetic field around a current-carrying straight conductor, while Fleming's left-hand rule gives the direction of force on a current-carrying conductor placed in an external magnetic field.
- D Fleming's left-hand rule applies only to circular loops and solenoids, not to straight conductors.
Generated by claude-sonnet-4-6 · 2026-06-26 01:13 · grounding rag
Model Answer
(C) The right-hand thumb rule gives the direction of the magnetic field around a current-carrying straight conductor, while Fleming's left-hand rule gives the direction of force on a current-carrying conductor placed in an external magnetic field.
Explanation
The textbook clearly states that the right-hand thumb rule is used to find the direction of the magnetic field around a straight current-carrying conductor, and that Fleming's left-hand rule gives the direction of force on a conductor in a magnetic field. Options A, B, and D are factually incorrect as per the source.