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Electromagnetism
By reducing the current through the cable, power loss in the form of heat dissipation can be
increased
reduced
constant
none of above
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Electromagnetism
When the plane of the coil is parallel to the lines of magnetic force, the number of lines of magnetic force passing through the coil will be
minimum
maximum
zero
none of above
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Electromagnetism
If a coil is rotated in a magnetic field, there will be induced a
current
wave
friction
stress
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Electromagnetism
When a coil rotated in magnetic field the induced current in it
continuously changes
remains same
becomes zero
becomes maximum
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Electromagnetism
The Electromotive force (EMF) developed by the generator depends upon
area of rotating wire
length of rotating wire
radius of wire
size of magnet
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Comment
Electromagnetism
A power station generates 600 MW of electrical power which is fed to a transmission line. If the input voltage is 300 Kv, then what current would flow in the transmission line?
5 × 10
3
 A
10 × 10
3
 A
2 × 10
3
 A
7 × 10
3
 A
Author:
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Electromagnetism
Transformers only work with
direct current (DC)
alternating current (AC)
charges
radioactive substances
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Electromagnetism
The study of magnetic effects of current is called
mechanical energy
magnetism
potential difference
electromagnetism
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Comment
Electromagnetism
The force on a wire inside a magnetic field increase when
the current is increased
strength of magnetic field increases
length of wire is increased
all of above
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Electromagnetism
An electrical switch that opens and closes under the control of another electrical circuit is called
fuse
relay
breaker
transformer
Author:
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Comment
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