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Physics, 07.09.2019 04:10 amuijakobp78deg

If a 9 v battery with 4 ω contact resistance is used and the relay has 80 ω and the wire has 10 ω/mile, what is the maximum telegraph distance which will result in a 50 ma current through the relay circuit loop?

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If a 9 v battery with 4 ω contact resistance is used and the relay has 80 ω and the wire has 10 ω/mi...
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