An electrostatic air filter is designed to remove dust particles from the air in a room - Edexcel - GCSE Physics - Question 2 - 2015 - Paper 1
Question 2
An electrostatic air filter is designed to remove dust particles from the air in a room.
A fan blows dusty air past several metal rods and metal plates.
There is a l... show full transcript
Worked Solution & Example Answer:An electrostatic air filter is designed to remove dust particles from the air in a room - Edexcel - GCSE Physics - Question 2 - 2015 - Paper 1
Step 1
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
C (gain electrons): In this context, the air filter is designed to remove dust particles by charging them. The dust particles gain electrons through the friction caused by the passing air, resulting in a negative charge that allows them to be attracted to the positively charged plates.
Step 2
An explanation linking attraction (force).
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Answer
The dust particles experience a force of attraction towards the plates because the plates are positively charged. This positive charge attracts the negatively charged dust particles, causing them to adhere to the plates and thereby purifying the air.
Step 3
transferred to plate / lost.
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Answer
The dust particles lose their negative charge as they transfer electrons to the metal plates, causing them to become neutral and thus effectively cleaned from the air.
Step 4
An explanation linking any two of: Metal is a conductor.
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Answer
Metals are conductors because they allow the easy flow of electrons. When a voltage is applied, electrons move through the metal plates and rods, facilitating the process of charging the dust particles as they pass through.
Step 5
Q = 1.2 x 10^3 x 40.
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Answer
To determine the charge (Q), we utilize the formula Q = I imes t, where I is the current (1.2 x 10^3 A) and t is the time (40 seconds). Thus, we can calculate the total charge supplied over that interval.
