Question

Which of the following determines the direction of magnetic field due to a current carrying conductor?
A. Faraday’s law of electromagnetic induction
B. Fleming’s left hand rule
C. Lenz’s law
D. Maxwell’s cork screw rule

Answer 1

Hint: The question talks about the performances of a conductor induced or contacted by current in a magnetic field force. Conductors often carry magnetic flux when passed through an atmosphere of magnetism.

Complete step by step answer:
We are given to find the rule which determines the direction of magnetic field induced due to a current carrying conductor.
Maxwell’s cork screw rule states that every section of an electric current or conductor experiences a current, such electric forces due to its own or to any superposed magnetic field would cause the circuit to link with maximum magnetic flux.
As against the other three options were Faraday’s law of electromagnetic induction which primarily connects magnetic fields and an electric circuit in order to produce an electromotive force (emf), which talks about the work done in driving a unit charge from one point to another.
Fleming’s Left hand rule is close to the correct option but it differs slightly because the direction of magnetic field is known unlike Maxwell’s cork screw rule that the direction needs to be found and determined.
Lenz’s law connects the direction of electric current which is induced in a conductor by changing the magnetic field per time.
Therefore, the correct answer is Option D, Maxwell’s cork screw rule determines the direction of magnetic field due to a current carrying conductor.

Note:Maxwell’s cork screw rule can be restated as if a right handed screw is rotated along the wire so that it moves in the direction of current, then the direction in which the thumb rotates gives the direction of the magnetic field.