Q1. [1] straightforward exam-ready
Which rule is used to find the direction of the force experienced by a current-carrying conductor placed perpendicular to a magnetic field?
(A) Right-hand thumb rule
(B) Fleming's left-hand rule
(C) Maxwell's right-hand rule
(D) Fleming's right-hand rule
- A Right-hand thumb rule
- B Fleming's left-hand rule
- C Maxwell's right-hand rule
- D Fleming's right-hand rule
Generated by claude-sonnet-4-6 · 2026-06-26 01:09 · grounding rag
Model Answer
(B) Fleming's left-hand rule
Fleming's left-hand rule gives the direction of force on a current-carrying conductor placed perpendicular to a magnetic field.
Source: Chapter 12, Section 12.3
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Explanation
- Right-hand thumb rule is used to find the direction of the magnetic field around a current-carrying conductor — not the force on it.
- Fleming's left-hand rule specifically deals with the force (motion) on a conductor: forefinger → magnetic field, middle finger → current, thumb → force/motion.
- Fleming's right-hand rule is used for induced current (generators), not force.
- In MCQs, examiners expect you to clearly distinguish between these three rules. Option (B) is the one stated explicitly in the textbook's summary: "the force acting on the conductor will be given by Fleming's left-hand rule."