E.4.2 Long Straight Wire
A power resistor set-up is used with a storage battery to deliver a hundred amperes to a heavy copper wire to orient iron filings or compass needles for overhead projection.
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E.4.2 Long Straight Wire A power resistor set-up is used with a storage battery to deliver a hundred amperes to a heavy copper wire to orient iron filings or compass needles for overhead projection.
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