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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The Biotsavart's law is a general modification of

Ampere's law
Lenz's law
Faraday's laws
Kirchhoff's law

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Magnetism and Electromagnetism
There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb?

9,000 At/Wb
14,400 At/Wb
90,000 At/Wb
1,440 At/Wb

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Magnetism and Electromagnetism
What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At × m?

1 At/Wb
11 At/Wb
111 At/Wb
1111 At/Wb

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Magnetism and Electromagnetism
Magnetising steel is normals difficult because

it has low permeability
it has high specific gravity
it corrodes easily
it has high permeability

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Magnetism and Electromagnetism
A permeable substance is one

Which is a good conductor
Which is a strong magnet
Through which the magnetic lines of force can pass very easily
Which is a bad conductor

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

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

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