Which magnets are prepared by mechanical or electrical methods?
Natural magnets
Artificial magnets
Soft Iron
All the above
The strength of a electromagnet's magnetic field depends on
no. of turns in its solenoid
magnitude of current flowing through solenoid
material inserted inside the solenoid
All of these
What is the naturally occuring magnets?
Magnetite
Manganese
Boaxite
The armature of a electric door bell is made up of
Soft iron bar
Steel
Copper
Nickel
An alternating current has
constant magnitude
periodic magnitude
zero magnitude
discrete magnitude
An electric motor converts electrical energy to
heat energy
thermal energy
mechanical energy
rotational energy
A dynamo produces
electric current
constant voltage
magnetic field
electric field
Which rule tells us the direction of field lines?
Maxwell's right hand thumb rule
Right hand corkscrew rule
Left hand magnetic rule
None of these
In which direction the magnetic compass pointer always gets attracted?
North
North - East
South
South - West
Identify the device having a magnet.
Door bell
Candle
Match stick
Lamp
