a strong magnent is stroked on an iron bar from on end to the other a number of time questions and answers
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Once a magnet is fully magnetised, it cannot be made any stronger as it is fully 'saturated'. ... As more magnets are stacked together, the strength will increase until the length of the stack is equal to the diameter. After this point, any further magnets added will provide a negligible increase in performance
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Maximum Iron fillings stick to the Iron Bar
Increase in Magnetic Field
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