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Electromagnetism
A step-up transform has a turns ratio of 1: 200. An alternating supply of 15 V is connected across the primary coil. The secondary voltage should be
3000 volts
1500 volts
1000 volts
2000 volts
Author:
rikazzz
Comment
Electromagnetism
If the secondary voltage is smaller than the primary voltage, the transformer is called a
positive transformer
step-up transformer
negative transformer
step-down transformer
Author:
rikazzz
Comment
Electromagnetism
The current-carrying loop inside the magnetic field rotate due to the
current acting on the coil
torque acting on the coil
couple acting on the coil
light acting on the coil
Author:
rikazzz
Comment
Electromagnetism
As per Faraday’s law of electromagnetic induction, the value of induced electromotive force in a circuit is directly proportional to the rate of change of the number of
potential difference
electromagnetic difference
magnetic lines of force
electromagnetic induction
Author:
rikazzz
Comment
Electromagnetism
The power is transmitted over long distances and high voltages to
minimize the energy loss
maximize the energy loss
make energy content constant
preserve energy
Author:
rikazzz
Comment
Electromagnetism
The 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
mutual induction
speed of relative motion of coil
speed of relative motion of magnet
Author:
rikazzz
Comment
Electromagnetism
A generator inside a hydroelectric dam uses electromagnetic induction to convert the mechanical energy of a spinning turbine into
chemical energy
atomic energy
heat energy
electrical energy
Author:
rikazzz
Comment
Electromagnetism
When the surface is held perpendicular to the magnetic lines of force, the number of lines of force is
negative
zero
maximum
minimum
Author:
rikazzz
Comment
Electromagnetism
Electric motors works on the principle of
capacitors
friction
couple
torque
Author:
rikazzz
Comment
Electromagnetism
Lenz devised a rule to find out the direction of
current induced in a circuit
electromagnetic difference
potential difference
flow of power in fuse
Author:
rikazzz
Comment
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