test","extracted_subject":"PHYSICS","extracted_chapter":"ELECTRIC CHARGES AND FIELDS","extracted_topic":"ELECTRIC CHARGES","questionPreviewUrl":"https://cdn.pureessence.tech/question-previews/packed_canvases/canvas_480.png?top_left_x=1064&top_left_y=0&width=532&height=251&app=solveeit"},"seo_metadata":{"keywords":[]},"doubt_solver_data":{"concept_summary":[]},"embeddings":[],"is_hidden":false,"_id":"66d23c7970136192204bc861","slug":"the-electric-potential-at-point-a-is-20-volts-and-","content":"The electric potential at point A is 20 volts and B is – 20 volts. The work done by an external force in moving electron slowly from B to A is-","options":[{"_id":"68aa8a227f15af4716dad8db","text":"– 6.4 × 10^–18 J","sequence":0,"isCorrect":true},{"_id":"68aa8a227f15af4716dad8dc","text":"+ 6.4 × 10^–18 J","sequence":1,"isCorrect":false},{"_id":"68aa8a227f15af4716dad8dd","text":"4 × 10^–20 J","sequence":2,"isCorrect":false},{"_id":"68aa8a227f15af4716dad8de","text":"– 4 × 10^–20 J","sequence":3,"isCorrect":false}],"correct_answer":"– 6.4 × 10^–18 J","explanation":"W = q (V_f – V_i) = – e (V_A – V_B)\n\nW = – 1.6 × 10^–19 (20 – (– 20))\n\n= – 1.6 × 10^–19 × 40 = – 6.4 × 10^–18 J","question_type":"single_choice","appeared_in":[],"created_at":"2024-08-30T21:41:13.258Z","__v":0,"vector_store_id":"924c166b-875a-4998-ac66-d7356cd1b497","updated_at":"2024-08-30T21:41:13.258Z","isStarred":false},"params":{"questionSlug":"the-electric-potential-at-point-a-is-20-volts-and-"}}]}]]

Question: The electric potential at point A is 20 volts and B is – 20 volts. The work done by an external forc...

Solution