Скачать или смотреть 2024 CAIE AS & A level October November Physics Paper 13 Q N 35 (9702/13/O/N/24) by Sajit C Shakya

Solution to 2024 CAIE AS & A level October November Physics Paper 13 Q N 35 (9702/13/O/N/24) by Sajit Chandra Shakya from Nepal

Chapter - CURRENT ELECTRICITY

The diagram shows part of a circuit that uses a potentiometer wire to measure a potential difference (p.d.) in an external circuit.

The potentiometer wire XZ has length L1. It is connected to a cell of known electromotive force
(e.m.f.) E that has negligible internal resistance.

Terminals P and Q are connected to the external p.d. to be measured. The length of the
potentiometer wire between points X and Y is L2.

The ratio of the lengths L1 and L2 is used to determine the p.d. between P and Q in terms of E.
Which condition must be met in order to determine this p.d.?

A The current I1 must be zero.

B The current I2 must be zero.

C The p.d. across YZ must be zero.

D The resistance of the external circuit must be zero.