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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The attraction capacity of electromagnet will increase if the

Core area increases
Flux density increases
Core length increases
Flux density decreases

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Magnetism and Electromagnetism
What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?

3 AT
300 AT
30 AT
0.3 AT

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Magnetism and Electromagnetism
In the left hand rule, forefinger always represents

direction of force on the conductor
current
Voltage
magnetic field

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Magnetism and Electromagnetism
The susceptibility of paramagnetic materials generally lies between

KT4 and KT8
10"2 and KT5
KT3 and 1CT6
1CT3 and 1CT7

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Magnetism and Electromagnetism
A permeable substance is one

Through which the magnetic lines of force can pass very easily
Which is a good conductor
Which is a bad conductor
Which is a strong magnet

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Magnetism and Electromagnetism
For a given wirewound core, an increase in current through the coil

increases the flux density
reverses the flux lines
decreases the flux density
causes no change in flux density

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MORE MCQ ON Magnetism and Electromagnetism

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