The newest 12 of 12 written questions. Open one to see it on the real paper.
Using your answers to (a), (c)(iii) and (c)(iv), determine the values of B and n. Include appropriate units. B =
See it on the paper →There is a constant current in the solenoid. Coil C is moved through the solenoid from position X to position Y. On Fig. 6.2, sketch a line to show the variation of the magnetic flux linkage in coil C with position as it moves from X to Y. flux linkage 0 X Y position Fig. 6.2
See it on the paper →Explain the shape of your line in (a)(i).
See it on the paper →Coil C is now held stationary at X. The current in the solenoid varies so that the magnetic flux density B at X varies from time 0 to time 4t as shown in Fig. 6.3. 0.080 B / T 0.040 0 0 2t t 4t 3t time Fig. 6.3 Calculate the maximum magnetic flux linkage in coil C. flux linkage = Wb
See it on the paper →On Fig. 6.4, sketch a line to show the induced electromotive force (e.m.f.) E in coil C from time 0 to time 4t. E 0 0 t 2t 3t time 4t Fig. 6.4
See it on the paper →A metal spring rests on a smooth table. The turns of the spring are equally spaced. The ends of the spring are connected to a d.c. power supply, as shown in Fig. 6.5. spring to power supply to power supply smooth table Fig. 6.5 The spring is connected to the d.c. power supply using flexible leads. The spring is not und...
See it on the paper →Calculate the magnetic force per unit length exerted on wire Q by wire P. force per unit length = N m –1
See it on the paper →State the direction of the force exerted on wire Q by wire P.
See it on the paper →The flux density of the magnetic field at wire P due to the current in wire Q is 1.5 mT. Determine the magnitude of the current in wire P. Explain your reasoning. current = A
See it on the paper →By considering the magnetic force on the sphere, show that the flux density of the uniform magnetic field is 0.14 T.
See it on the paper →On Fig. 6.1, draw arrows to indicate the direction of the magnetic field at each of the points X, Y and Z.
See it on the paper →Compare the magnitude of the flux density of the magnetic field: ● at X and at W ● at Y and at Z.
See it on the paper →Most candidates correctly calculated the force per unit length.
— Examiner report, May/June 2023, 9702/43 Q6(c)(i) (Cambridge)
Many correct directions were stated here. However, many candidates did not either remember that currents in opposite directions would cause a repelling force or could use Fleming’s left-hand rule to deduce this from first principles.
— Examiner report, May/June 2023, 9702/43 Q6(c)(ii) (Cambridge)
Many candidates determined the correct magnitude of current in wire P. However, a large number did not explain their reasoning or did not do so fully enough.
— Examiner report, May/June 2023, 9702/43 Q6(c)(iii) (Cambridge)
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