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Electromagnetism
If the coil is placed perpendicular to field lines then the number of lines passing through the coil is
minimum
maximum
zero
may be max. or min.
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Electromagnetism
The strength of magnetic field is defined as
field lines passing through surface
electric field lines passing the loop
current through surface
electrons passing a specific point per unit time
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Electromagnetism
To increase or decrease AC voltages, we use
fuse
circuit breaker
transformer
generator
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Electromagnetism
A transformer is designed to convert the voltage from 240 V a.c mains to 12 V, and has 4000 turns on its primary coil. The turns on its secondary coil should be
100
200
120
480
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rikazzz
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Electromagnetism
A step done transformer has a turns ratio of 100: 1. An ac voltage of amplitude 170 V is applied to the primary. If the current is 1 mA in the primary, the current in the secondary should be
0.5 A
0.1 A
0.2 A
0.6 A
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rikazzz
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Electromagnetism
Electric motor is a device which converts electric energy into
potential energy
rotational energy
kinetic energy
rotational kinetic energy
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Electromagnetism
When the plane of the coil is perpendicular 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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rikazzz
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Electromagnetism
The type of temporary magnet, which is created when current flows through a coil is called an
electromagnet
mechanical energy
magnetism
potential difference
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Electromagnetism
Electric charges can be separated into
two types
single type
no type
three types
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Electromagnetism
The loop in magnetic field rotates due to
Electromotive force (EMF)
frequency
resistance
torque
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