Direction of induced emf can be obtained from
Lenz's law
Flemings right hand rule
Flemings left hand rule
Both 1 and 2
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
In an electric motor, the energy transformation is:
from electrical - chemical
from chemical - light
mechanical - electrical
electrical - mechanical
At neutral point the resultant magnetic field is
∞
90
0
1
Which of the following is not a part of ac generator ?
Field magnet
Armature coil
Slip ring
Commutator
Electric bell is one of the commonly used application of:
electromagnet
permanent magnet
transformer
Pick out correct expression.
In a step up transformer?
Ns = Np
Ns < Np
Ns > Np
Nothing can be said
Es Is =
Ep Is
Ep Ip
Ep ⁄ Ip
Es Ip
