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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?

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

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Magnetism and Electromagnetism
What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?

22 x 10"8 N
22 x 10"7 N
22 x 10-6 N
22 x 10"5 N

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Magnetism and Electromagnetism
The change of cross-sectional area of conductor in magnetic field will affect

both of the listed here
resistance of conductor
reluctance of conductor
None of these

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Magnetism and Electromagnetism
The unit of relative permeability is

None of the listed here
Hennry
Its dimensionless
Hennry/meter

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

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Magnetism and Electromagnetism
A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be

M
M/2
M/4
2M

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