A. 80 J
B. 500 J
C. 300 J
D. 120 J

Correct Answer:

Option B – 500 J

Explanation

Efficiency = work output/work input×100

= 40 = (20×10)/ x 100
= 500J

SEE ALSO  The diagram above shows the resultant electric field pattern due to two electric point charges P and S. Which of the following statements is correct?

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