choose the wrong statement
Magnetic poles exist in pairs
Magnetic poles have equal strength
like poles repel each other
Unlike poles repel each other
Which of the following device converts mechanical energy into electrical energy?
Dynamo
Electric motor
Solenoid
Ammeter
The charged body at rest produces
Electric field
Magnetic field
Neither A or B
Both A & B
Which of the following domestic appliance uses an electric motor?
Electric fan
Milk cooker
Pressure cooker
Cooking gas
The safety device to protect an electric circuit from overloading or short circuiting is
Earthing
Electric fuse
Magnetic induction
Electrolysis
Commonly used safety fuse wire in made of
Copper
Pb
Ni
An alloy of tin & lead
The region around a magnet within which it can experience a magnetic force is called
Magnetic pole
Magnet induction
Magnetic attraction
Choose correct statement about magnetic lines of force
Lines of force are not imaginary lines
Can not be mapped on paper
Do not intersect each other
Always intersect each other.
Carbon brushes are used in
Electromagnet
Bar magnet
None
An insulated wire wound in the form of a helix with a large no of turns in
A solenoid
A toroid
A galvenoscope
Emulators