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Static electricity

3. Hold up the proof plane to an Activity 1.12
electroscope and note minor
deflections. Aim: Demonstrate where the charge

4. Touch the pointed side of resides
the conductor with the proof Materials: Proof plane, leaf electroscope,
FOR ONLINE READING ONLY
plane aluminium foil, hollow charged
5. Hold up the proof plane to conductor
an electroscope and note the
deflection Proof plane

Questions

(a) What can you say about the
deflection of the leaf in steps
3 and 5?
(b) Write a summary of your
observation.

Hollow charged Gold leaf
In a solid conductor, the electrons conductor electroscope
move apart when charges are Figure 1.43
gathered from various points on Procedure
the conductor. The extent of this 1. Charge a hollow shaped conductor as shown
divergence is influenced by the in Figure 1.43.
quantity of charges collected at 2. Using proof plane, touch of the inside the
each location. As demonstrated conductor.
in Activity 1.11, the leaf shows
greater divergence when charges 3. Hold up the proof plane to an electroscope
are drawn from a sharp point and note the deflection.
compared to the flat end of the 4. Touch the outside of the conductor with the
object. Conversely, in a hollow proof plane.
conductor, charges collected 5. Hold up the proof plane to an electroscope
from the exterior cause the leaf and note the deflection.
to diverge, while those collected
from the interior show no Questions
divergence. This suggests that in (a) What can you say about the deflection of
any conductor, charges primarily the leaf in step 3 and 5?
exist on the outside rather than (b) Write a summary of your observations.
within the material.

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Physics Form 2 Final.indd 31 25/10/2025 10:25