Magnetic effect of electric current was discovered by
Max well
Oersted
Ampere
Fleming
Circuit Breaker Device which can be used in place of fuse wire in domestic electric wiring is called :
CBD
DCB
MCD
MCB
Magnetic lines of force
form closed circuits
cannot intersect
are crowded together near the poles
all the above are correct
The most suitable material for making the core of an electromagnet is :
soft iron
brass
aluminium
steel
are mere directions
have no physical reality
can be used to indicate the direction of the magnetic of the magnetic field of a point
The magnetic field lines :
intersect at right angles to one another
intersect at an angle of 45o to each other
do not cross one another
cross at an angle of 60o to one another
At what voltage is the electric power generated at the power generating station?
11 kV
25 kV
21 kV
40 kV
A switch is always connected to the
earth wire
neutral wire
live wire
none of these
The north-south polarities of an electromagnet can be found easily by using :
Fleming's right-hand rule
Fleming's left-hand rule
Clock face rule
Left-hand thumb rule
Fuse wire is generally made of alloy of
Tin and lead
Nichrome
Lithium
Copper
