In Fleming's right hand rule, the central finger indicates the direction of :

1. the magnetic field
2. the motion of conductor
3. the induced current
4. 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 :

1. e = i₀ sin 2πnt
2. e = e₀ sin 2πnt
3. e = e₀ sin 2πn/t
4. e = e₀ cos 2πnt

A current of constant magnitude and unique direction is called …………… while a current changing its magnitude and direction periodically is called ……………

1. a.c., d.c.
2. d.c., a.c.
3. a.c., a.c.
4. d.c., d.c.

The direction of induced current is obtained by:

1. Fleming's left hand rule
2. Clock rule
3. Right hand thumb rule
4. Fleming's right hand rule