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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What is the magneto-motive force (mmf) of a wire with 8 turns carrying three amperes of current?

2,400 At
24 At
2.4 At
240 At

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

direction of force on the conductor
Voltage
current
magnetic field

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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?

917 T
91 T
91.7 T
9.7 T

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Magnetism and Electromagnetism
Core of an electromagnet should have

None of the listed here
Both low coercivity and high susceptibility
Low coercivity
High susceptibility

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Magnetism and Electromagnetism
When the north poles of two bar magnets are brought close together, there will be

a force of attraction
no force
a force of repulsion
a downward force

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Magnetism and Electromagnetism
The unit for reluctance is

At/Wb
Wb
At/m
tesla

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MORE MCQ ON Magnetism and Electromagnetism

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