Q205 · Practice questionComplex familiar1 mark
QUESTION 205
Two equal positive point charges are at equal horizontal distances from a midpoint. O lies vertically above that midpoint, as shown. What is the direction of the resultant electric field at O?
(A)
Right
(B)
Up the page
(C)
Down the page
(D)
The field is zero.
WORKED SOLUTION
1 markAnswer B
ANSWER
B. Up the page
Worked solution
Each field points away from its positive charge. At O their equal horizontal components oppose and cancel. Their upward vertical components reinforce, giving an upward resultant.
Equivalent physically justified methods and consistent equivalent units accepted.
Displayed decimals are model answers; accept appropriate significant figures and consistent rounding from stated constants.
Select B.
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
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