Fig. 1.1 shows a thin coil of cross-sectional area $$$A$$$ and length $$$l$$$ connected to a resistor of resistance $$$S$$$ and two terminals. Fig. 1.1 An alternating voltage is applied to the terminals. The peak value of the alternating voltage is $$$E$$$ and the frequency is $$$f$$$. The peak value of the potential difference $$$V$$$ across the resistor is determined using an oscilloscope. It is suggested that $$$V$$$ is related to $$$f$$$ by the relationship $$\[ \frac{E S}{V}=\frac{K A N^{2} f}{l} \]$$ where $$$N$$$ is the number of turns on the coil and $$$K$$$ is a constant. Plan a laboratory experiment to test the relationship between $$$V$$$ and $$$f$$$. Draw a diagram showing the arrangement of your equipment. Explain how the results could be used to determine a value for $$$K$$$. In your plan you should include: - the procedure to be followed - the measurements to be taken - the control of variables - the analysis of the data - any safety precautions to be taken. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Physics

IGCSE&ALevel

CAIE

Exam No：9702_s25_qp_53 Year：2025 Question No：1

Answer:

1.3.1 understand that the avogadro constant Na is the number of atoms in 0.012kg of carbon-12

1.3.2 use molar quantities where one mole of any substance is the amount containing a number of particles equal to the avogadro constant Na

20.5 Electromagnetic induction

21.1.1 understand and use the terms period, frequency, peak value and root-mean-square value as applied to an alternating current or voltage

21.1.2 deduce that the mean power in a resistive load is half the maximum power for a sinusoidal alternating current

21.1.3 represent a sinusoidal alternating current or voltage by an equation of the form

21.1.4 distinguish between r.m.s. and peak values and recall and solve problems using the relationshipfor the sinusoidal case

9.1.1 understand that electric current is a flow of charge carriers

9.1.2 understand that the charge on charge carriers is quantised

9.1.3 define the coulomb

9.1.4 recall and use Q = It

9.1.5 derive and use, for a current-carrying conductor, the expression I = Anvq, where n is the number density of charge carriers

9.2.1 define potential difference and the volt

9.2.2 recall and use V = $\frac{W}{Q}$

9.2.3 recall and use P = VI and P = I2R

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