Magnetic lines of force
form closed circuits
cannot intersect
are crowded together near the poles
all the above are correct
A fuse wire is always connected to:
Earth wire
Neutral wire
Live wire
Between live and neutral lines
An MCB which cuts off the electricity supply in case of short-circuiting or overloading works on the :
chemical effect of current
heating effect of current
magnetic effect of current
electroplating effect of current
Fuse wire is generally made of alloy of
Tin and lead
Nichrome
Lithium
Copper
The unit of self inductance is
henry
weber/m2
siemens
ampere-turn per weber
A switch is always connected to the
earth wire
neutral wire
live wire
none of these
The electric appliances in a house are connected in
series
parallel
either series or parallel
both in series and parallel
A d.c. generator is based on the principle of :
electrochemical induction
electromagnetic induction
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
