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Physics for Secondary Schools
11. Look at the following images in increases to 240 pF. How much
the table. Redraw the images in more charge can be put on the
the second column to show how capacitor using the 18 V supply?
the spheres will move because of 14. A sharp needle was brought close to
the nature of the charges. Write an the cap of a charged leaf electroscope.
FOR ONLINE READING ONLY
explanation in the last column. Explain why the leaf collapsed.
Charged Draw Explanation 15. (a) Determine the effective
spheres how they capacitance of the circuit shown
will move
in Figure 1.50.
(b) How much charge is stored?
3.0 V
+
9
0.3 µF
4
12. (a) Why is lightning attracted to tall 9
4
structures? Explain the factors 0.6 µF
that make certain objects more Figure 1.50
likely to be struck by lightning
during a thunderstorm. 16. After walking on a carpeted floor,
(b) List and describe at least three you sometimes get a mild electric
types of capacitors, including shock when you touch a metal door
their construction, properties, knob. Explain how this happens.
and typical applications. 17. The ruler Figure 1.51 has been
(c) Identify and explain the function rubbed with a cloth. Describe what
of at least three household or is happening in itand why.
industrial appliances that use
capacitors
13. A capacitor of two parallel plates
separated by air has a capacitance
of 15 pF. A potential difference of
18 volts is applied across the plates.
(a) Determine the charge on the
capacitor.
(b) If the space between is filled
with mica, the capacitance now
Figure 1.51
38
Student’s Book Form Two
Physics Form 2 Final.indd 38 25/10/2025 10:25
