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 $3L$
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The electric field strength due to a point charge decreases with the square of the distance. Thus, at a distance of 3L, the electric field strength is calculated as:
E_{3L} = rac{E}{(3)^2} = rac{E}{9}
So, the electric field strength is 9E.
Step 2
Electric potential at a distance $3L$
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The electric potential due to a point charge decreases linearly with distance. At a distance of 3L, the electric potential is:
