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Chapter 20 - Electromagnetism - 5
1.
Force acting upon the conductor is _______, only when it is placed at right angle to the field.
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2.
Current can only pass through a ________.
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3.
Two equal but opposite forces from a _______ of forces.
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4.
DC motor converts the electrical energy into _________ energy.
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5.
A galvanometer is used to measure _________.
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6.
The number of magnetic lines of force passing through any surface is known as magnetic _______ through that surface.
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7.
If the magnetic flux through a coil or solenoid is changing, an _____ is induced in it .
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8.
The mangnitude of induced emf in a coil depends upon the _______ of relative motion.
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9.
In1831, Michael Faraday discovered the phenomenon of ___________.
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10.
When a coil rotates in a magnetic field the flux passing through it continously __________.
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11.
In AC generator, rotation of the coil in a magnetic field generates an ______ induced emf.
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12.
When current is passed through a galvanometer its needle is ________.
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13.
The number of lines of force in a megnetic field depends upon the _______ of the field.
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14.
A stronger field has _________ lines than a weaker one.
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15.
Transformer is a device used to increase or decrease the value of alternating __________.
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16.
A rectangular _____ rotates between permanent magnet in a generator.
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17.
A rectangular _____ rotates between permanent magnet in a generator.
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