Which one of the following laws of electromagnetism does not give the direction of magnetic field ?
Right-hand thumb rule
Fleming's left-hand rule
Fleming's right-hand rule
Faraday's law of electromagnetic induction
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC CDS-1 – 2021
The Right-hand thumb rule gives the direction of the magnetic field produced by a current-carrying wire. Fleming’s Left-hand rule gives the direction of the force acting on a current-carrying conductor placed in a magnetic field (given the directions of current and magnetic field). Fleming’s Right-hand rule gives the direction of the induced current when a conductor moves in a magnetic field (given the directions of motion and magnetic field). Faraday’s law of electromagnetic induction states that a changing magnetic flux through a circuit induces an electromotive force (EMF). While the change in magnetic flux involves the magnetic field, Faraday’s law primarily quantifies the magnitude of the induced EMF and does not directly provide a rule for determining the direction of the magnetic field itself. (Lenz’s law, often used alongside Faraday’s law, provides the direction of the induced current/EMF, opposing the change in flux).
Faraday’s Law quantifies the magnitude of induced EMF due to changing magnetic flux; the other rules/laws listed are primarily used to determine directions related to magnetic fields, current, force, or motion.