In which device a coil of conducting wire is rotated by some mechanical means in between the poles of a magnet?
Electric motor
Electric door bell
Dynamo
Transformer
A direct current has
Alternating magnitude
Constant magnitude
Discrete magnitude
Zero magnitude
In a step down transformer, no. of turns in primary coil are:
less than that of secondary
greater than that of secondary
equal to that of secondary
a constant
The angle between the Earth's magnetic field and the Earth's spin axis is
23.3 °
10 °
11 °
13.5°
An alternating current has
constant magnitude
periodic magnitude
zero magnitude
discrete magnitude
The number of magnetic poles when a magnet breaks is
decreases
increases
zero
same
In which direction the magnetic compass pointer always gets attracted?
North
North - East
South
South - West
An electric motor converts electrical energy to
heat energy
thermal energy
mechanical energy
rotational energy
Electromagnet is produced by
permanent magnet
current
magnetic moment
voltage
The magnetic field of the Earth is similar to that of a
compass
bar magnet
horse shoe magnet
All of above
