Correct Answer: Option A

Explanation

P = 40W

  R = 90W

  V = ?

  P = \(\frac{V^2}{R}\)

  V\(^2\) = PR = 40 x 90

  V\(^2\) = 3000

  V = √3600

  V = 60N

There is an explanation video available below.

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