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

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Magnetism and Electromagnetism
A permanent magnet

Attracts ferromagnetic substances and repels all others
Attracts only ferromagnetic substances
Attracts all paramagnetic substances and repels others
Attracts some substances and repels others

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Magnetism and Electromagnetism
The magnetic reluctance of a material

Decreases with increasing cross sectional area of material
Increases with increasing cross-sec-tional area of material
Any of the listed here
Does not vary with increasing cross-sectional area of material

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