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Edexcel | Physics WPH0 | S 16 4 1 | 1 hour 30 minutes

Boards | Edexcel | Physics WPH0

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14

A student is investigating the laws of electromagnetic induction. She drops a bar magnet

through the centre of a coil of wire as shown.

As the bar magnet falls through the coil an e.m.f ε is induced.

The graph shows how ε varies with time t.

14

(a)

5 Mark s

Explain the shape of the graph.

(QWC – work must be clear and organised in a logical manner using

technical terminology where appropriate)

Links the magnitude of (induced) e.m.f. to rate of change/cutting of flux

(linkage) (accept equation)

Indication that magnet’s speed increases as it falls

Positive (max) value > negative (max) value

Or Time for second pulse shorter

(this mark is dependent on awarding MP2)

The areas of the two parts of the graph will be the same (since Nφ constant)

Links Lenz’s law to the change in polarity of e.m.f.

14

(b)

2 Mark s

A data logger was used in this experiment rather than a voltmeter.

Describe experimental conditions that make a data logger most suitable for collecting

data.

Any two

High sampling rate

Different quantities to be taken at the same time

measurements to be taken remotely

experiments can be carried out over a long period of time.

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