At a distance $L$ from a fixed point charge, the electric field strength is $E$ and the electric potential is $V$ - AQA - A-Level Physics - Question 15 - 2020 - Paper 2
Question 15
At a distance $L$ from a fixed point charge, the electric field strength is $E$ and the electric potential is $V$.
What are the electric field strength and the elec... show full transcript
Worked Solution & Example Answer:At a distance $L$ from a fixed point charge, the electric field strength is $E$ and the electric potential is $V$ - AQA - A-Level Physics - Question 15 - 2020 - Paper 2
Step 1
Electric field strength at a distance $3L$ from the charge
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Answer
The electric field strength E due to a point charge varies inversely with the square of the distance. Therefore, at a distance r=3L, the electric field strength can be expressed as:
E' = rac{E}{(3)^2} = rac{E}{9}
Thus, the electric field strength at a distance 3L is 9E.
Step 2
Electric potential at a distance $3L$ from the charge
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Answer
The electric potential V due to a point charge varies inversely with the distance. Therefore, at a distance r=3L, the electric potential can be expressed as:
V' = rac{V}{3}
Thus, the electric potential at a distance 3L is 3V.
