10.1. Practical circuits
A subsection of Physics, 9702, through 10. D.C. circuits
Listing 10 of 112 questions
A cell E, of electromotive force (e.m.f.) 2 V and negligible internal resistance, is connected to a uniform resistance wire of resistance 10  and length 1.0 m. E Z P Q resistance wire Z is a connection that may be made at any position along the resistance wire. A galvanometer is connected between Z and a point Q. A new source of e.m.f. of approximately 8 mV is connected between points P and Q. The e.m.f. of the new source is determined by changing the position of Z until the reading on the galvanometer is zero. Which change to the circuit allows a much more precise value for the e.m.f. of the new source to be obtained?
9702_w22_qp_13
MCQ
2022
Paper 1, Variant 3
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112