4.1. Simple magnetism and magnetic fields
A subsection of Physics, 5054, through 4. Electricity and magnetism
Listing 10 of 115 questions
shows a permanent magnet lying on a piece of paper. paper magnet Underline the material in the list from which it is possible to make a strong, permanent magnet. aluminium copper glass iron mercury plastic steel Describe an experiment to plot the pattern and the direction of the magnetic field surrounding the magnet. You may draw on , if you wish. shows the N-pole of a magnet placed in front of the S-pole of a second magnet. J K – + N-pole S-pole A section of a horizontal, metal wire JK lies in the magnetic field between the two magnetic poles. End K of the metal wire is connected to the positive terminal of a battery and end J is connected to the negative terminal. Explain in terms of electrons, why there is a current in the wire and state the direction of the conventional current. The part of JK that is in the magnetic field experiences a force F. State the direction of F and describe how this direction is deduced. The equipment in is used in a similar experiment. The part of JK that lies between the poles of the magnets, now passes through a long iron tube that is fixed in position. The tube is shown in . J K – + iron tube JK is connected to the battery in the same way as before. State what happens to force F on the wire. Explain your answer. The iron tube and the wire JK are removed. A square, vertical coil is placed between the poles so that the plane of the coil lies in the magnetic field as shown in . N-pole S-pole square coil Explain why the coil tries to rotate when there is a current in the coil.
5054_w20_qp_22
THEORY
2020
Paper 2, Variant 2
View
A bar magnet can rotate freely around a thin rod through its centre. The bar magnet is at rest on a frictionless horizontal surface in a laboratory which is shielded from the Earth’s magnetic field. State a substance from which the bar magnet could be made. The thin rod is perpendicular to the top and bottom surfaces of the bar magnet. shows a view from above of the bar magnet with the N pole, the S pole and the thin rod labelled. S N thin rod (viewed from above) Draw on to show the pattern and the direction of the magnetic field around the bar magnet. An electromagnet is switched on and a strong magnetic field is created around the bar magnet. shows that the direction of the strong magnetic field due to the electromagnet is from left to right across the page. S N magnetic field lines due to electromagnet Draw arrows on to show the direction of the horizontal forces that act on the poles of the bar magnet. Describe and explain what happens to the bar magnet when the electromagnet is switched on.
5054_w24_qp_21
THEORY
2024
Paper 2, Variant 1
View
Questions Discovered
115