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Electromagnetism
When the surface is held parallel to the magnetic lines of force, the number of lines of force is
negative
zero
maximum
minimum
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Electromagnetism
At city substation, the AC is stepped down to
130 V
120 V
320 V
220 V
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Electromagnetism
The power is transmitted over long distances at high voltage to minimize the
loss of energy
loss of air
loss of light
cost
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Electromagnetism
The force on the wire is at right angles to both the direction on the magnetic field and the direction of the current. This is discovered by
Faraday
Ampere
Fleming
Johns Burge
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Electromagnetism
The number of magnetic lines of force passing through any surface is called
nature of magnetic field
strength of magnetic field
work of magnetic field
weakness of magnetic field
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Electromagnetism
Change in no. of magnetic field lines induces
current in coil
Electromotive force (EMF) in the coil
frequency in coil
all of above
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Electromagnetism
The mechanical energy of our hand used to push the magnet towards or away from the coil results into
potential energy
heat energy
kinetic energy
electrical energy
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Electromagnetism
A practical application of mutual induction is called
generator
fuse
circuit breaker
transformer
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Electromagnetism
Transformers are used to
increase AC only
decrease AC only
constant AC
increase and decrease AC
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Electromagnetism
In transformer the changing current in primary coil induces changing magnetic field in
resistor
inductor
insulator
secondary coil
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