Physics
A current of constant magnitude and unique direction is called …………… while a current changing its magnitude and direction periodically is called ……………
- a.c., d.c.
- d.c., a.c.
- a.c., a.c.
- d.c., d.c.
Related Questions
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
The direction of induced current is obtained by:
- Fleming's left hand rule
- Clock rule
- Right hand thumb rule
- Fleming's right hand rule
In a step up transformer:
- Ns = Np
- Ns < Np
- Ns > Np
- nothing can be said