IB Physics HL B.5 Current and circuits questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

Type

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Question 1

Paper 2Medium7 marks

A positive charge $q$ moves between the terminals of component P or component Q in the direction of conventional current. $W$ is the electrical work transferred to the component. For each component, the potential difference is constant during the measurements. Figure 1 shows measured values of $W$ for different values of $q$ Treat potential differences as magnitudes.

(a)

Explain why the gradient of a graph of $W$ against $q$ represents the potential difference across a component.

[2]

(b)

Determine the potential difference across component P using Figure 1.

[2]

(c)

A positive charge of $0.60\ \mathrm{C}$ passes through component Q. Determine the work transferred to Q. State which component transfers more energy per unit charge, and by what factor.

[3]

Question 2

Paper 2Medium9 marks

The circuits in Figure 1 are used to compare solid samples X and Y. The sources are ideal and the ammeters have negligible resistance. The samples have equal length and cross-sectional area and are each maintained at $20^\circ\mathrm{C}$

(a)

Identify which sample is an insulator.

[1]

(b)

Determine the resistance of each sample.

[3]

(c)

The voltage across X is then reduced to $1.5\ \mathrm{V}$ Its temperature remains at $20^\circ\mathrm{C}$ and its resistance is assumed unchanged. Calculate the electrical energy transferred to X in $40\ \mathrm{s}$ Show your working.

[3]

(d)

Explain, in terms of the mobility of charge carriers, why the readings in Figure 1 are consistent with X being a conductor and Y an insulator.

[2]

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