2016 · M/J · 5054/21 | Q11

Back Next

75-mark sittingChoose one alternative where offered and two Section B questions; practice marks across routes are not combined.

All questions

Question 1115 marks · Practise this topic →

Options

Available practice: 73 of 75 marks. Parts 7(a) await marking support. Scores cover available parts only. Theory Paper 2: Section A is compulsory and Section B offers a choice of two questions. Four published mark-scheme discrepancies across the two variants are held from automatic marking.

(a)(i)Induced currents can be formed in a coil of wire by electromagnetic induction. Describe how to demonstrate the formation of an induced current in a coil of wire. Sketch and label a diagram of the arrangement of the apparatus.

Answer guidance

Draw Accuracy is being marked. Use the figure and be precise about position and labels.

[3 marks]

(a)(ii)Induced currents can be formed in a coil of wire by electromagnetic induction. State two changes to the apparatus that increase the induced current.

Answer guidance

State A short answer. No explanation is needed, and adding one cannot earn extra marks.

[2 marks]

(a)(iii)1Induced currents can be formed in a coil of wire by electromagnetic induction. State Lenz’s Law.

Answer guidance

State A short answer. No explanation is needed, and adding one cannot earn extra marks.

[2 marks]

(a)(iii)2Induced currents can be formed in a coil of wire by electromagnetic induction. Describe how Lenz’s Law applies in the experiment you described in (a)(i).

Answer guidance

Describe Say what happens, in order. Reasons are not required unless the question also asks why.

[2 marks]

(b)(i)1A factory receives 500 kW at 33 kV from a generator. Calculate the current in its transmission wires.

Answer guidance

Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.

[2 marks]

(b)(i)2A factory receives 500 kW from a generator. Calculate the electrical energy supplied to the factory in one hour.

Answer guidance

Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.

[2 marks]

(b)(ii)A factory receives electrical energy through 33 kV transmission lines. Explain why transmitting at this high voltage reduces energy loss in the lines.

Answer guidance

Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.

[2 marks]

5054/21/M/J/16Cambridge O Level Physics 5054 · May/June 2016 · Paper 2 variant 1 · Question 11