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Magnetism and Electromagnetism

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

2.4 AT
24 AT
0.24 AT
240 AT

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

240 At
2,400 At
2.4 At
24 At

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Magnetism and Electromagnetism
A keeper is used to

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

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Magnetism and Electromagnetism
Fleming's left hand rule is used to find

Direction of force on a current carrying conductor in a magnetic field
Direction of flux in a solenoid
Polarity of a magnetic pole
Direction of magnetic field due to current carrying conductor

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Magnetism and Electromagnetism
Which of the following is a ferromagnetic material?

Aluminium
Nickel
Tungsten
Copper

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Magnetism and Electromagnetism
The susceptibility of paramagnetic materials generally lies between

10"2 and KT5
KT4 and KT8
1CT3 and 1CT7
KT3 and 1CT6

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