Question

State 

(a) Fleming’s right hand rule, 

(b) Lenz’s law for finding the direction of induced current. Which of the above laws is most suitable for finding the direction of current in 

1. straight conductor 

2. coiled conductor ?

Answer 1

(a) Fleming’s right hand rule:

(1) Generator rule : “Stretch the thumb, fore finger and central finger of right hand mutually perpendicular to each other. If the fore finger indicates the direction of magnetic field and thumb indicates the direction of motion of the conductor then central finger will indicate the direction of induced current.” 

(2) Lenz’s Law : “The direction of induced e.m.f. (or induced current) always tends to oppose the cause which produces it.” 

(a) In straight conductor — Fleming’s Right Hand Rule 

(b) in coiled conductor — Lenz’s Law.