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In a $100$ bus power system, there are $10$ generators. In a particular iteration of Newton Raphson load flow technique (in polar coordinates), two of the $PV$ buses are converted to $PQ$ type. In this iteration,

- The number of unknown voltage angles increases by two and the number of unknown voltage magnitudes increases by two.
- The number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes increases by two.
- The number of unknown voltage angles increases by two and the number of unknown voltage magnitudes decreases by two.
- The number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes decreases by two.

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