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I can't understand the physics problems circled in the picture. I hope experts can analyze and explain in detail. Thank you!
(2) The galvanometer G reading is zero. The voltage across G is equal.

When k hits a, it is: Es=UAH=E*RAH/RAB.

When k hits b: Ex=UAF=E*RAF/RAB.

Available: Ex=Es*RAF/RAH

And RAF/RAH=LAF/LAH=Lx/L0,

Namely: Ex=Es*Lx/L0

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