May/June 2026 Paper 61

2026 · 4 questions · 21 parts · 40 marks

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1(a)1(b)1(c)1(d)

–/11 mks

2(a)(i)2(a)(ii)2(a)(iii)2(a)(iv)2(b)(i)2(b)(ii)2(c)(i)2(c)(ii)2(d)

–/11 mks

3(a)3(b)(i)3(b)(ii)3(c)3(d)3(e)3(f)

–/11 mks

–/7 mks

2(a)(i)Easy1 mark

A student investigates resistance. Refer to Figure 2.1.

Figure 2.1, a circuit with a cell and a switch in series with an ammeter and a resistance wire BC of length l, and a voltmeter connected across the wire

Figure 2.2 shows the readings on the meters.

Figure 2.2, an ammeter with a scale from 0 to 1.0 A and a voltmeter with a scale from 0 to 5 V, each with its needle pointing at a reading

Record the current

I_{1}

shown in Figure 2.2. Include the unit.

2(a)(ii)Easy2 marks

Record the potential difference (p.d.)

V_{1}

across the resistance wire BC shown in Figure 2.2. Include the unit.

Unit

2(a)(iii)Easy1 mark

Calculate the resistance

R_{1}

of the resistance wire using the equation:

R_{1} = \frac{V _{1}}{I _{1}}

2(a)(iv)Easy1 mark

The length of the resistance wire is 50 cm. Calculate

r

, the resistance per cm of the resistance wire, using the equation:

r = \frac{R _{1}}{50 cm}

2(b)(i)Easy1 mark

The student has a length of the same resistance wire wound on a wooden rod, as shown in Figure 2.3.

Figure 2.3, resistance wire wound in a number of turns around a wooden rod, with a free end of wire at each side

Record the number of whole turns

N

of wire on the rod.

2(b)(ii)Easy1 mark

The student measures the diameter

d

of the rod.

d

= 2.3 cm Calculate a value

l_{1}

for the length of wire on the rod using the equation:

l_{1} = N π d

2(c)(i)Easy1 mark

The student:

disconnects the resistance wire from the circuit shown in Figure 2.1
connects the wire on the rod to the circuit at B and C
measures the current $I_{2}$ in the circuit

I_{2}

= 0.41 A

measures the potential difference (p.d.) $V_{2}$ across the resistance wire on the rod.

V_{2}

= 1.8 V Calculate the resistance

R_{2}

of the resistance wire on the rod using the equation:

R_{2} = \frac{V _{2}}{I _{2}}

2(c)(ii)Easy1 mark

Calculate another value

l_{2}

for the length of resistance wire on the rod using your values from 2(a)(iv) and 2(c)(i) and the equation:

l_{2} = \frac{R _{2}}{r}

Give your answer in centimetres to the nearest millimetre.

2(d)Medium2 marks

The values of the lengths

l_{1}

and

l_{2}

are different from each other. The value

l_{1}

from 2(b)(ii) is from distance measurements. The value

l_{2}

from 2(c)(ii) involves electrical measurements. Suggest which value,

l_{1}

l_{2}

, is more accurate. Give a reason for your answer, comparing the two methods.

Your answer