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 ?
A. 63.38 N/Wb
B. 633.8 N/Wb
C. 6338 N/Wb
D. 63380 N/Wb
Answer: Option C
Related Questions on Magnetism and Electromagnetism
Which of the following is a vector quantity?
A. Relative permeability
B. Magnetic field intensity
C. Flux density
D. Magnetic potential
What is the magneto-motive force (mmf) of a wire with 8 turns carrying three amperes of current?
A. 2,400 At
B. 240 At
C. 24 At
D. 2.4 At
Magnetism of a magnet can be destroyed by
A. heating
B. hammering
C. by inductive action of another magnet
D. by all above methods
Strength of an electromagnet can be increased by
A. increasing the cross-sectional area
B. increasing the number of turns
C. increasing current supply
D. all above methods
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