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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The induced voltage across a stationary conductor in a stationary magnetic field is

reversed in polarity
decreased
increased
zero

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Magnetism and Electromagnetism
The direction of a magnetic field within a magnet is

back to front
from south to north
front to back
from north to south

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Magnetism and Electromagnetism
Indicate which of the following material does not retain magnetism permanently.

Hardened steel
None of the listed here
Stainless steel
Soft iron

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Magnetism and Electromagnetism
Ferrites are a sub-group of

Paramagnetic material
Non-magnetic materials
Ferri-magnetic material
Ferro magnetic material

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Magnetism and Electromagnetism
A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be

0.24 N
24 N
240 N
2.4 N

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

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

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MORE MCQ ON Magnetism and Electromagnetism

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