Magnetism and Electromagnetism
A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?

63.38 N/Wb
6338 N/Wb
633.8 N/Wb
63380 N/Wb

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Magnetism and Electromagnetism
Out of the following statements, concerning an electric field, which statement is not true?

Unit field intensity in the exertion of a force of one newton on a charge of one coulomb
The electric intensity is a vector quantity
The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point
An electric field is defined as a point in space at which an electric charge would experience a force

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Magnetism and Electromagnetism
A permanent magnet

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

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