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O is the centre of a negatively charged sphere - AQA - A-Level Physics - Question 13 - 2021 - Paper 2
Question 13
O is the centre of a negatively charged sphere. K and L are two points at a distance r₁ from O. M and N are two points at a distance r₂ from O. Which statement is ... show full transcript
Worked Solution & Example Answer:O is the centre of a negatively charged sphere - AQA - A-Level Physics - Question 13 - 2021 - Paper 2
Step 1
C No work is done moving an electron from M to N.
Answer
In electric fields, the work done moving a charge is dependent on the potential difference between the initial and final positions.
Since both M and N are at the same distance, r₂, from the center O of the negatively charged sphere, they are at the same electric potential. Therefore, when moving an electron from M to N, there is no change in potential energy, resulting in no work being done.
Hence, the correct answer is C.