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KCET2017PhysicsMotion in Two Dimensions

In the A.C. circuit shown, keeping ' ( K ) ' pressed, if an iron rod is inserted into the coil, the bulb in the circuit,

Options

  1. Aglows more brightly
  2. Bglows less brightly
  3. Cglows with same brightness (as before therod is inserted)
  4. Dgets damaged

Correct answer

B. glows less brightly

Step-by-step solution

If an iron rod is inserted into the coil, the inductive reactance in the circuit will increase thereby increasing the effectiveinductance of the circuit. Therefore, the potential differenceand thus, the current in the circuit will decrease and hence bulb glows less brightly

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