Physics
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
Answer
the induced current
Reason — According to Fleming's right hand rule — Stretch the thumb, central finger and forefinger of your right hand mutually perpendicular to each other. If the forefinger indicates the direction of magnetic field and the thumb indicates the direction of motion of the conductor, then the central finger will indicate the direction of induced current. Hence, central finger indicates the direction of the induced current.
Related Questions
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)
Lenz's law is based on :
- conservation of momentum
- conservation of energy
- conservation of force
- none 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
In our houses, the frequency of electric supply is :
- 100 Hz
- 70 Hz
- 50 Hz
- 40 Hz