25 A magnetic needle of pole strength 20 3 Am is pivoted at its centre...
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25 A magnetic needle of pole strength 20 3 Am is pivoted at its centre Its N pole is pulled eastward by a string The horizontal force required to produce a deflection of 30 from magnetic meridian take B 10 T is 1 4 10 N 3 127 133 3 10 N 2 2 10 N 4 4 3x10 N
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