A. At the focal point
B. At the centre of curvature
C. Beyond the centre of curvature
D. Between the focal point and the pole
E. Between the focal point and the center of curvature
Correct Answer:
Option A – At the focal point
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![A beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal. [neglect the weight of the beam]](https://myschool.ng/storage/classroom/4288835607_maths-15.jpg "A beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal. [neglect the weight of the beam]")