Test Preparation on Electromagnetic Induction-III-Physics Test Series For NEET 2020
1.
A transformer is based on the principle of
2.
Core of transformer is made up of
3.
In an ideal transformer the number of turns of primary and secondary coil is given as 100 and 300 respectively. If the power input is 60 W, the power output is
Efficiency of a transformer,
N=Power output/Power input
For an ideal transformer, h = 1 Power output = Power input = 60 W.
4.
In an A.C. generator, when the plane of the armature is perpendicular to the magnetic field-
5.
If rotational velocity of a dynamo armature is doubled, then induced e.m.f. will become-
