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Magnetism and Electromagnetism

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
When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle

will be infinite
will be zero
will depend on the amount of e.m.f. applied
will depend on the radius of the circle

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Magnetism and Electromagnetism
The initial permeability of an iron rod is

The permeability almost in non-magnetised state
The lowest permeability of the iron rod
The highest permeability of the iron rod
The permeability at the end of the iron rod

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Magnetism and Electromagnetism
Reciprocal of permeability is

Permeability
Reluctivity
Susceptibility
conductance

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

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

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Magnetism and Electromagnetism
The most effective and quickest may of making a magnet from soft iron is by

Placing it inside a coil carrying current
Induction
The use of permanent magnet
Rubbing with another magnet

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