A level Physics Paper 3 Edexcel Exam
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Describe the method to determine the acceleration of a freely falling object, using an electromagnet -
CORRECT ANSWERS 1. Open switch to break connections between battery and electromagnet
in the primary circuit and turn on the timer in the secondary circuit
2. Electromagnet demagnetises causing steel ball to fall a distance, h, from the bottom of the ball to the
top of the trap door, measure h with a ruler
3. When the ball falls through the trap door it stops the timer
4. Record the time taken to fall h, repeat process three times, discard anomalies and find average time
5. Vary h and record corresponding t
How do analyse the results from the acceleration of a freely falling object, using an electromagnet -
CORRECT ANSWERS s= h
u=0
a=g
t=t
using s=ut+0.5at^2
t^2 = 2/g * h
,plot t^2 against h and draw a line of best fit
g = 2/m
What saftey precautions should you use in determing the acceleration of a freely falling object, using an
electromagnet - CORRECT ANSWERS If dropping of a table, clamp electromagnet stand to table
to prevent it toppling over
be aware of falling ball, use a tray to capture ball at bottom
small currents used in circuit, no danger of electric shock
What are the possible errors in the method to determine the acceleration of a freely falling object, using
an electromagnet - CORRECT ANSWERS small t values, use a larger distance to reduce
uncertainty
time delay between the timer starting and ball being released due to residual magnetism in ball, use a
lower current so that the electromagnet has a weaker magnetic feild
Air resistance, use a smaller heavier ball so travels faster.
Describe the method to determine the electrical resistivity of a material - CORRECT ANSWERS
1. At various points along the wire measure the diameter, d, repeat at 90 degree angles at the same
point get about 6 readings and find average, and calculate the cross-sectional area, A,
2. Connect circuit shown above
, 3. At 10 cm intervals from the crocodile clips, touch wire with probe, record voltage,v, and current, I,
readings on Voltmeter and ammeter
4. Calculate resistance R as V/I
5. Measure length of wire,L , from one crocodile clip along the wire and record coresponding values of R
How do you analyse the results of how to determine the electrical resistivity of a material - CORRECT
ANSWERS Plot R against L and draw line of best fit with eqaution
R = p/A * L
calculate the resistivity
p = gradient * A
What saftey precautions should you use in determing the electrical resistivity of a material - CORRECT
ANSWERS small voltage used so little danger of electric shock
wire may get warm so dont touch unless with probe
Evaluate the possible errors in determining the electrial resistivity of a material - CORRECT ANSWERS
If there is a highly varying volatage/ current readings, remove power supply, voltmeter, ammeter and
replace with ohm meter (connect clips/probe directly to it )
Uncertainty from micrometre is doubled as radius is sqaured
With Questions and Answers All
Answers 100% Verified (Latest Update
2025/2026 RATED A+
Describe the method to determine the acceleration of a freely falling object, using an electromagnet -
CORRECT ANSWERS 1. Open switch to break connections between battery and electromagnet
in the primary circuit and turn on the timer in the secondary circuit
2. Electromagnet demagnetises causing steel ball to fall a distance, h, from the bottom of the ball to the
top of the trap door, measure h with a ruler
3. When the ball falls through the trap door it stops the timer
4. Record the time taken to fall h, repeat process three times, discard anomalies and find average time
5. Vary h and record corresponding t
How do analyse the results from the acceleration of a freely falling object, using an electromagnet -
CORRECT ANSWERS s= h
u=0
a=g
t=t
using s=ut+0.5at^2
t^2 = 2/g * h
,plot t^2 against h and draw a line of best fit
g = 2/m
What saftey precautions should you use in determing the acceleration of a freely falling object, using an
electromagnet - CORRECT ANSWERS If dropping of a table, clamp electromagnet stand to table
to prevent it toppling over
be aware of falling ball, use a tray to capture ball at bottom
small currents used in circuit, no danger of electric shock
What are the possible errors in the method to determine the acceleration of a freely falling object, using
an electromagnet - CORRECT ANSWERS small t values, use a larger distance to reduce
uncertainty
time delay between the timer starting and ball being released due to residual magnetism in ball, use a
lower current so that the electromagnet has a weaker magnetic feild
Air resistance, use a smaller heavier ball so travels faster.
Describe the method to determine the electrical resistivity of a material - CORRECT ANSWERS
1. At various points along the wire measure the diameter, d, repeat at 90 degree angles at the same
point get about 6 readings and find average, and calculate the cross-sectional area, A,
2. Connect circuit shown above
, 3. At 10 cm intervals from the crocodile clips, touch wire with probe, record voltage,v, and current, I,
readings on Voltmeter and ammeter
4. Calculate resistance R as V/I
5. Measure length of wire,L , from one crocodile clip along the wire and record coresponding values of R
How do you analyse the results of how to determine the electrical resistivity of a material - CORRECT
ANSWERS Plot R against L and draw line of best fit with eqaution
R = p/A * L
calculate the resistivity
p = gradient * A
What saftey precautions should you use in determing the electrical resistivity of a material - CORRECT
ANSWERS small voltage used so little danger of electric shock
wire may get warm so dont touch unless with probe
Evaluate the possible errors in determining the electrial resistivity of a material - CORRECT ANSWERS
If there is a highly varying volatage/ current readings, remove power supply, voltmeter, ammeter and
replace with ohm meter (connect clips/probe directly to it )
Uncertainty from micrometre is doubled as radius is sqaured
