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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The retentivity of material is useful for the construction of

Non-magnetic substances
Transformers
Permanent magnets
Electromagnets

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Magnetism and Electromagnetism
What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200?

12
4
8
6

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Magnetism and Electromagnetism
What is the flux density when the flux is 5.5 Wb and the cross-sectional area is 6 × 10–3 m2?

91.7 T
917 T
91 T
9.7 T

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Magnetism and Electromagnetism
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

Remain same
None of the listed here
Decreases
Increases

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Magnetism and Electromagnetism
A keeper is used to

Change the direction of magnetic lines
Amplify flux
Restore lost flux
Provide a closed path for flux

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Magnetism and Electromagnetism
Magnetic moment is a

scalar quantity
vector quantity
pole strength
universal constant

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MORE MCQ ON Magnetism and Electromagnetism

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