CAIE A-Level Physics A2 20.5.3 The Conce…Linkage

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(a)

A small coil C has 64 turns and cross-sectional area $0.71 \mathrm{~cm}^{2}$ . The coil is placed inside a solenoid as shown in Fig. 6.1.

Fig. 6.1

The centre of coil C is on the central axis of the solenoid.

[ 3 ]

(i)

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 .

Fig. 6.2

[ 1 ]

(ii)

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 4 t as shown in Fig. 6.3.

Fig. 6.3

Calculate the maximum magnetic flux linkage in coil C .
flux linkage = Wb

[ 2 ]

$\Phi=B A N$ $\begin{aligned} =0.080 \times 0.71 \times 10^{-4} \times 64 =3.6 \times 10^{-4} \mathrm{~Wb} \end{aligned}$

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CAIE A-Level Physics A2 20.5.3 The Concept of Magnetic Flux Linkage Topic Practice

Question 1

Question (a)

Question (i)

Question (ii)