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Magnetism and Electromagnetism

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

2,400 At
240 At
2.4 At
24 At

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

300 At
18.75 At
187 At
30 At

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Magnetism and Electromagnetism
Which of the following is a vector quantity?

Magnetic potential
Flux density
Relalative permeability
Magnetic field intensity

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Magnetism and Electromagnetism
Gilbert is a unit of

conductance
permittivity
magnetomotive force
electromotive force

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Magnetism and Electromagnetism
Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials.

rectangular
circular
triangular
None of the listed here

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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

Decrease
Be excessive
Remain Constant
Increase

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