It is required to design a zener shunt regulator to provide a regulated voltage of about 10 v. the available 10-v, 1-w zener of type 1n4740 is specified to have a 10-v drop at a test current of 25 ma. at this current, its r z is 7 . the raw supply, v s , available has a nominal value of 20 v but can vary by as much as ±25%. the regulator is required to supply a load current of 0 ma to 20 ma. design for a minimum zener current of 5 ma.

i think if it were me i whould divide 300 dide 15

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the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it