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Coil's resistance from a DC test, then its inductance or power on AC

This type of question, asked 2 times: 6 Apr 2024, 9 Apr 2024. All 2 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    6 Apr 2024

    24
    When a dc voltage of 100 V100\text{ }V is applied to an inductor, a dc current of 5A flows through it. When an ac voltage of 200 V200\text{ }V peak value is connected to inductor, its inductive reactance is found to be 203Ω20\sqrt{3}\Omega. The power dissipated in the circuit is _____ WW.

  2. Question 2

    9 Apr 2024

    28
    When a coil is connected across a 20 V20\text{ }V dc supply, it draws a current of 5 A5\text{ }A. When it is connected across 20 V,50 Hz20\text{ }V,50\text{ }Hz ac supply, it draws a current of 4 A4\text{ }A. The self inductance of the coil is ______ mHmH. (Take π=3\pi= 3 )