The presence of magnetic field at a point can be detected by
Strong magnet
A solenoid
Compass needle
A current carrying wire
Which of the following is not a part of ac generator ?
Field magnet
Armature coil
Slip ring
Commutator
Which of the following looks like a helical spring ?
Solenoid
Current carrying conductor
Weber / meter2 is the unit of
Magnetic field
Magnetic flux
Magnetic intensity
Magnetic force
Which of the following flows only in one direction?
DC
AC
Both 1 and 2
None of these
The direction of induced current is obtained by
Fleming's left hand rule
Clock rule
Right hand thumb rule
Fleming's right hand rule
By reversing the direction of current in a wire, the magnetic field produced by it
gets reversed in direction
increases in strength
decreases in strength
remains unchanged in strength and direction
At neutral point the resultant magnetic field is
∞
90
0
1
Which of the following has its working based on electromagnetic induction?
DC motor alone
AC generator alone
Transformer alone
Both AC generator and transformer
Es Is =
Ep Is
Ep Ip
Ep ⁄ Ip
Es Ip
