Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Units (Magnetism & Electromagnetism)
80 practice questions
Topics covered
Practice questions
11–20 of 39 · Normal
Question 11
3 marks · Normal
Answer and see the solution →A student investigates an electromagnet. She measures a current of 2.0 amperes flowing through the coil when a voltage of 12.0 volts is applied.
(a)[1 mark]State the SI unit for current.
(b)[1 mark]State the SI unit for voltage.
(c)[1 mark]Calculate the electrical power supplied to the coil. Give the unit.
Question 12
1 mark · Normal
Answer and see the solution →Name the SI unit for power.
Question 13
2 marks · Normal
Answer and see the solution →Explain why it is important to use the correct SI unit when measuring electric current, voltage, and power in physics experiments.
Question 14
2 marks · Normal
Answer and see the solution →A light bulb is connected to a power supply. The supply provides a voltage of 6.0 V, and a current of 0.40 A passes through the bulb. Calculate the power delivered to the bulb. Give your answer to 2 significant figures and include the correct unit.
Question 15
3 marks · Normal
Answer and see the solution →The table below shows measurements taken from different electrical devices.
Voltage and current for three devices. Device Voltage (V) Current (A) Fan 230 0.30 Lamp 12 0.50 Heater 120 1.50 For each device, calculate the power consumption. Write your answers with units.
(a)[1 mark]Fan
(b)[1 mark]Lamp
(c)[1 mark]Heater
Question 16
4 marks · Normal
Answer and see the solution →A student investigates the magnetic field around a bar magnet using iron filings.
(a)[2 marks]Describe how the student should arrange the apparatus to show the pattern of the magnetic field around the bar magnet using iron filings.
(b)[2 marks]State what can be learned about the magnetic field from the pattern of the iron filings.
Question 17
4 marks · Normal
Answer and see the solution →A student investigates the magnetic field around a bar magnet using plotting compasses.
(a)[2 marks]Describe how the student should use plotting compasses to show the direction of the magnetic field around the bar magnet.
(b)[2 marks]State what is meant by a magnetic field line and explain what information about the field is provided by the direction and spacing of the lines.
Question 18
1 mark · Normal
Answer and check →Which statement is correct about magnetic field lines around a bar magnet?
- A.They start at the south pole and end at the north pole
- B.They form open curves that never meet
- C.They are closest together where the field is strongest
- D.They indicate where the magnetic field is weakest
Question 19
3 marks · Normal
Answer and see the solution →Figure 1 shows the magnetic field lines drawn around a bar magnet.
Magnetic field lines around a bar magnet (a)[1 mark]Label with arrows the direction of two field lines on the diagram.
(b)[2 marks]Explain why the magnetic field is strongest at the poles of the bar magnet.
Question 20
2 marks · Normal
Answer and see the solution →A student says: 'A magnetic field line shows the direction from the south pole of a magnet to the north pole.'
Is the student correct? Explain your answer, referring to field line directions and how they relate to the magnetic force.