Physics 9702 · AS & A Level · Force on a current-carrying conductor
Force on a current-carrying conductor — practice question
A rigid straight copper wire XY is clamped in place within a uniform magnetic field of flux density $2.6 \times 10^{-3}\,\text{T}$, as illustrated in Fig. 6.1. The wire XY is $4.7\,\text{cm}$ long and is inclined at an angle of $34^\circ$ to the magnetic field.
(a)[2]
Calculate the force on the wire produced by a steady current of $5.4\,\text{A}$ in the wire.
(b)[3]
The current in the wire is now replaced by an alternating current with r.m.s. value $1.7\,\text{A}$. Determine the total variation in the force on the wire caused by the alternating current.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Applies $F = BIL\sin\theta$” …