ISRO Electrical Engineering (EE) 2015 - Question 79

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If a phasor is multiplied by j then

  • A. Only its magnitude changes
  • B. Only its direction changes
  • C. Both magnitude and direction changes
  • D. Both magnitude and direction remains unchanged

Answer: B. Only its direction changes

Explanation: In the complex plane, multiplying by j = 1 ∠90° rotates the phasor counter-clockwise by 90° without altering its magnitude.

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