(a) What is the unknown emf x in a potentiometer that balances when R x is 10.0,...

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(a) What is the unknown emfx in a potentiometer that balances when Rx is 10.0Ω, and balances when Rs, is 15.00Ω for a standard 3.000-V emf? 

(b) The same emfx is placed in the same potentiometer, which now balances when Rs, is 15.0Ω for a standard emf of 3.100 V. At what resistance Rx will the potentiometer balance?

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