Physics
Lenz's law is based on :
- conservation of momentum
- conservation of energy
- conservation of force
- none of the above
Answer
conservation of energy
Reason — Lenz's law is based on the law of conservation of energy. It shows that the mechanical energy is spent in doing work against the opposing force experienced by the moving magnet, and it is transformed into the electrical energy due to which current flows in the solenoid.
Related Questions
In electromagnetic induction, energy transformation is from :
- Electrical to mechanical
- Mechanical to electrical
- Electrical to chemical
- None of the above
The magnitude of induced emf depends on the :
- number of turns in the coil
- rate of change of magnetic flux linked with each turn
- current
- Both (1) and (2)
In Fleming's right hand rule, the central finger indicates the direction of :
- the magnetic field
- the motion of conductor
- the induced current
- all of the above
In an a.c. generator the coil makes n rotations per second. The magnitude of induced emf at any instant t is given by :
- e = i0 sin 2πnt
- e = e0 sin 2πnt
- e = e0 sin 2πn/t
- e = e0 cos 2πnt