CAIE IGCSE Physics 5.2.1.4 Count Rate Measured in Counts S or Topic Practice

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Question 1

[Maximum number: 6]

Question (a)

(a)

Fig. 10.2 shows an electric door lock.

The slot in the door contains an unmagnetised iron bolt attached to a spring.
The slot in the door frame is empty. This slot is surrounded by the coils of a solenoid.
In Fig. 10.2 the door is unlocked. The spring is not stretched.

Fig. 10.2

Fig. 10.2

In Fig. 10.3 the door is locked. The spring is now stretched.

Fig. 10.3

Fig. 10.3

The bolt is initially in the position shown in Fig. 10.2.
Describe and explain what happens when

[ 6 ]

Question (i)

(i)

the switch S is closed,

[ 4 ]

Question (ii)

(ii)

the switch S is reopened.

[ 2 ]
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