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Direction of induced emf in a circuit is in accordance with law of
conservation of mass
conservation of energy
Conservation of momentum
conservation of charge
Direction of an induced current in a circuit is always such that it opposes cause that produces it. This law was introduced by
Faraday
Johns Burge
Fleming
Lenz
Power is transmitted over long distances at high voltage to minimize
loss of energy
loss of light
loss of air
cost
By reducing current through cable, power loss in form of heat dissipation can be
constant
None of the above
reduced
increased
Through a conductor, an electric current produces a
Magnetic field
magnetism
potential difference
mechanical energy
Direction of force on a current-carrying wire in a magnetic field can by found by using
Fleming's right hand rule
left hand grip rule
Fleming's left hand rule
right hand grip rule
An electrical switch that opens and closes under control of another electrical circuit is called
relay
fuse
Transformer
breaker
Generators produce electric current due to movement of wires near
small magnets
very large magnets
Metals
Gases
At city sub station AC is stepped down to
320 V
120 V
130 V
220 V
A step done transformer has a turns ratio of 100 : 1. An ac voltage of amplitude 170 V is applied toprimary.
If current is 1 mA in primary, current in secondary should be
0.1 A
0.5 A
0.6 A
0.2 A
A coil of wire consisting of many loops is known as
photon
Pole
solenoid
magnet
Phenomenon of induction of induced current in one coil due to change of current in a neighboring coil is called
flow of power in fuse
speed of relative motion of coil
mutual induction
speed of relative motion of magnet
As per Michael Faraday, if forefinger points direction of magnetic field, middle finger in direction of current, then thumb would indicate
Both a and b
direction of force acting on the conductor
direction of magnetic field
None of the above
If AC source is 240 V and a transformer supplies 12 V to a model train which draws current of 0.8 A then primary current is
0.4 A
0.04 A
1 A
2 A
If we increase number of loops, turning effect would
become zero
Increase
remain same
Decrease
Information of users which are read by ATM machines are stored on
magnetic box on card
magnetic strip on card
None of the above
inside ATM machine
Force on a wire inside magnetic field increase when
the current is increased
length of wire is increased
All of above
strength of magnetic field increases
Magnetic poles
Both a and b
can be separated
can not be separated
None of the above
When surface is held perpendicular to magnetic lines of force, number of lines of force is
maximum
Zero
Minimum
Negative
Electric charges can be separated into
three types
two types
single type
no type
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