The newest 20 of 45 written questions. Open one to see it on the real paper.
Using the letters P, Q, R, S, W, X, Y and Z, identify the faces of the slice between which the Hall voltage is induced.
See it on the paper →The magnitude of the Hall voltage in Figure 7.1 is given by the equation BI Vy = nat: State the meanings of the symbols n, q and tin this equation.
See it on the paper →Explain the origin of the Hall voltage.
See it on the paper →Identify which of the faces in 7(a)(i) is at the higher potential. Explain your reasoning.
See it on the paper →Explain why the two wires exert a magnetic force on each other.
See it on the paper →On Fig. 7.2, draw an arrow to show the direction of the magnetic force exerted on wire X. Label your arrow F.
See it on the paper →The current in X is double the current in Y. State how the magnetic force exerted on wire Y compares with the magnetic force exerted on wire X.
See it on the paper →The direction of the current in both wires is now reversed. State, with a reason, the effect of this change on the direction of the force on wire X.
See it on the paper →Explain why the two wires exert a magnetic force on each other.
See it on the paper →On Fig. 7.2, draw an arrow to show the direction of the magnetic force exerted on wire X. Label your arrow F.
See it on the paper →The current in X is double the current in Y. State how the magnetic force exerted on wire Y compares with the magnetic force exerted on wire X.
See it on the paper →The direction of the current in both wires is now reversed. State, with a reason, the effect of this change on the direction of the force on wire X.
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 →Explain why the current causes a vertical force to act on the coil.
See it on the paper →Determine what is now the reading on the newton meter. Explain your reasoning. reading = N
See it on the paper →A thin copper sheet is suspended from a small hole near the top of the sheet and placed in a magnetic field, as shown in Fig. 1.1. t hole copper sheet area A direction of magnetic field Fig. 1.1 (not to scale) The sheet has area A and thickness t. The sheet is displaced from its equilibrium position through a horizonta...
See it on the paper →Determine the direction of the uniform magnetic field.
See it on the paper →Explain why the motion of the sphere in the horizontal plane is circular.
See it on the paper →State the two conditions that must be satisfied for a copper wire, placed in a magnetic field, to experience a magnetic force.
See it on the paper →Most candidates correctly calculated the force per unit length.
— Examiner report, May/June 2023, 9702/41 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, 9702/41 Q6(c)(ii) (Cambridge)
Candidates needed to explain why there is a force, and then to explain why this force is vertical. Candidates were generally more successful in answering the first point than the second point.
— Examiner report, October/November 2022, 9702/42 Q7(b)(i) (Cambridge)
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