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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Which of the following materials are diamagnetic?

Silver
Silver and copper
Iron
Copper

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Magnetism and Electromagnetism
Materials subjected to rapid reversal of magnetism should have

High permeability and low hysteresis loss
High co-ercivity and high retentivity
High co-ercivity and low density
Large area of B-H loop

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

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

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Magnetism and Electromagnetism
The commonly used material for shielding or screening magnetism is

Copper
Brass
Aluminium
Soft iron

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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?

9.7 T
91.7 T
91 T
917 T

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Magnetism and Electromagnetism
Unit for quantity of electricity is

Ampere
Ampere-hour
Joule
Coulomb

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MORE MCQ ON Magnetism and Electromagnetism

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